This is a long review because typing is fun and I'm bored.
Kanashiipanda's art style is unique, and very good. The animated parts flow nicely, and the still frames are very very good. You can justify the entire game on the art. Even the non-erotic art is good.
Beyond that, the game has a great soundtrack I would unironically listen to in my free time. I'm particularly fond of the tracks "Memetics" and "Not a happy bunny".
Consistently updated, with a lot of content. If you have a non-violent fetish, this more than likely caters to it, and if there are fetishes you dislike, you can mostly avoid them because almost all of the lewd content is player-choice related. You do have to use the lewd content to progress your abilities and the story, but the point I'm making is that you have a lot of options and you get to pick 90% of the time. If you tried hard enough, I'm sure you could beat the game solely through consensual sex with Succubus and Caroline if you were so inclined.
++ Character Review ++
(Character and Story Spoilers Ahead)
Jake: Jake is the POV character with a very silent protagonist name, but he does actually have personality. He's a very, very rare self-serious erotica protagonist, and I enjoy how gravely he approaches most of the plot. After all, the plot of this game is pretty dark, and I'm glad he's not wise-cracking or whining his way through it. His character is a fine-looking default wolf guy, which is okay with me.
Succubus: She has a name, I'm almost certain, but she's called succubus for most of the game so that's what I'm going with. She's a central part of the plot, and has her moments to be funny or serious. She does a good job in the job she is given, which is to be exposition woman. As she is not really a person, she has no art, but I do enjoy the way other characters change when she possesses them, from the eyes to the pose. The plot twist of the Succubus being who she ends up being was super out of left field, but surprisingly good once it settled. A little more foreshadowing would have been nice. Even if it's just a picture frame you can click on that has Jake say something.
Olivia: Protagonists mom, and a profoundly strangely written character, because she's depicted in some areas as a very doting, easily flustered mother with a teasing side, and in other areas of the game she's a relentless pervert who laughs at the notion of propriety. I personally enjoyed the innocent side of her better, as she seemed a lot more realistic and a lot more fun to talk to, but I guess if we want to interpret her as "layered" instead of inconsistent, it can be forgiven, and all that forgiveness comes from her character design. She's on the cover of the game for a reason.
Cassandra: She's a typical older-sister type who has an appealing design but not much else going on. Her relationship with Mel is easily her most interesting trait, and that's not really a compliment.
Caroline: Your sidekick for part I and one of the better written characters until very suddenly shifting personalities from self-doubting, dependent, hopeless, and frantic to extremely self-sufficient and slutty. Up until that stark point (it is addressed in the plot, but one or two acts of dominant sex does not justify the change to me) her dialogue is easily the saddest and most interesting of all the characters, by a wide, wide margin, and her arc resolution is great, I just think the aftermath was way too much. Her design is good too.
Julia: The POV character's established girlfriend, Julia feels like the weird hybrid of a band geek and a cheerleader, and it works. She's also one of the overtly slutty characters where it makes sense and doesn't conflict with another established trait. At first I dismissed her as a bit shallow, but she's got a few great lines hidden in there, especially during the whole body-swapping part. I think it's funny that the protagonist was also surprised that she had more depth than meets the eye, as he comments that he had no idea she actually put a lot of thought into her actions. Her design is great too.
Mia: Julia's mom, and a complete tangent of a character. You can beat the game without so much as speaking to her. If you bother to pursue her, you get some weird but interesting sex scenes that raise of lot of questions the game should probably leave unanswered.
Donovan: Julia's father, equally as unimportant as Mia, but unlike Mia, his presence makes the story worse. See, Mia and Donovan are both adulterers, and both sleep with Olivia, among others. The amount that they do not interact with one another, and the amount that Mia interacts with the player and others, makes Donovan's presence relegated exclusively to satisfying an adultery fetish. He simply does not exist as his own character, at least right now as of the update I played. I think Mia's character, and her relationship with Olivia/the player, would both be substantially more interesting if Donovan didn't exist, or died at some point. Yeah that would defeat the fetish, but it would also give the story with Mia a lot more room for depth, which would be worth it.
Mel: Cassandra's boyfriend, Mel exists to fulfill masculine stereotypes, and to the end he does a great job. He is in every way what a shut-in geek thinks an alpha male looks like, and in a visual novel type game, that's fine. He could use either a bit more humor or more backstory in my opinion, as he takes himself as seriously as Jake, but far as I can tell he has nothing going on to merit that seriousness. His design is the most mediocre of the cast. Also he has a weird thing for his girlfriend's mom. Fidelity really means nothing in this universe.
Valerie: I think she's a mule? I also think she's semi related to Mel, but I'm not sure. Either way, she's an interesting character with a more unique design than most of the cast can boast, but unfortunately, I paid little attention to her side-story. What I have seen was pretty good, but I really can't say more. Like Mia, she's not really involved in the story unless you go out of your way to involve her, but I think that's changing in part II. We'll see.
Every Supernatural Character Besides Succubus: Horny and not that interesting. A few also don't really mesh with the art direction. I feel bad being so general, especially with how much attention characters like the Raven Mother and others get in the story and out-of-universe artwork, but I really have nothing nice to say, and even less constructive to say. They are what they are, and it's... fine... I guess... Easily the least compelling characters, and least appealing to look like. If I have to say something meaningful, it's that G'nisi proves this art style does not mesh well with scalies. Maybe it could with a redesign, but I'm not sure.
+ Gripes +
(Big spoilers. Also some of this is just personal taste)
Having no choice but to share your girlfriend with Caroline after ACT I to become a thrupple is not a great resolution for a host of reasons. I like Caroline, and I like Julia, but I would much rather have had the choice to pick one over the other when the bell tolls. I think the reason this outcome feels not-wonderful for me specifically is because I barely even saw Julia during my first runs (as she is mostly optional for ACT I), so it felt very strange when the character you spent the whole game with up until that point basically becomes attached to a DIFFERENT character.
But even if you didn't have that issue, it seems like a not-great resolution. If you were really keen on Caroline as a romantic partner, I can see this being very annoying because now she's with someone else. If you were really into Julia as a romantic partner, I can see this being SUPER annoying, because now you have to share your girlfriend. I don't mind the thrupple resolution, and I wouldn't mind a harem resolution if the author absolutely must keep both romances open simultaneously, but I'd at least like the option to pick one or the other as well. That would make my opinion of act I's arcs go from 8/10 to 10/10.
Gripe numero dose: Donovan should die or something. That's probably just me (I'm almost certain it's just me), but I really think Mia would be a much, much more interesting side character (and a much less morally dubious one, but that doesn't really matter to my point) if Donovan perished, or better yet, died in the same attack that killed Jake's dad. Considering the grand sum of Donovan's in-universe participation includes about five lines of very mundane "hey how are you Jake" dialogue and one scene of him cheating with Olivia, his lack of existence would take away nothing, and let the space he wastes be filled with something much more interesting for characters that have a personality (Like Mia).
Every adult character and every male character that exists, Olivia is canonically engaged in sexual/romantic relations with. I find that silly and weird. This is more a nitpick and a "haha look that's funny" than anything I actually want to change.
Other than that, the writing is solid for an erotica game. Solid as in it works, as over the many hours of playing the game only two or three conversations ever struck me as deep.
+ FINAL THOUGHTS +
It's worth playing, and hey hey, worth the money if you're that kind of person. I'd personally change quite a few minor story elements, and tweak about two character designs (and remove Donovan), but otherwise it's enjoyable from front to back, and it's not a short journey.