Futakin Valley is a boss rush game with good concept, but ultimately, its execution is quite bad. I know, this game is in quite early in development, so I hope it address several issues I have.
=The graphics + animations: On one hand, this game has some pretty good art, the illustrations and CGs look great. The environment is also fantastically made. One thing I don't like is how during gameplay, your character is a chibi version of the illustration, which I know it's just a design choice, but I feel like it weakens the game's actions. On the other hand, the animation isn't the game's strong point. The animation is spine animation, which I personally don't enjoy, but it's more of a subjective view than anything, I am not deducting points from this.
=Music and sounds: Music is the same throughout every bosses, and the song is... meh. It honestly don't create this fighting atmosphere as much as I want it to. Outside of the boss, there's nothing but ambience. Well, at least that part isn't so bad. The sounds, though, is quite honestly not amazing, they don't really pop out during gameplay and really doesn't create any sort of feelings during gameplay.
=Gameplay: This game has an idea for its gameplay, but its attempt at it is not very good.
-Progression: is not very clear. But this isn't entirely bad, it creates this sort of freedom, kinda like a Souls game, where you can fight any boss at anytime.
- Mechanics: There's weapons that you can obtain, and metroidvania-like system where you unlock new things as you defeat bosses. Some weapons have special abilities that consumes a part of its "ability bar" on use. Each one is pretty unique so the selection of weapon is quite diverse. Movement is also nice, a sprint button (and auto-sprint in the game's options) and a Soul-game-like roll with invincibility. There's also a bestiary that show your progress (quite handy in case you missed something, assuming that you can 100% once the game is completed). There's also mysterious mushrooms that drops from mobs around certain part of the map that you can identify if you bring them to the "shopkeeper" of the game. All of these mechanics make me believe that this game should've been an actual metroidvania, rather than a boss-rush. But if the game devs wish to continue making it a boss-rush, then I don't see this being bad. Although, they should work on one thing and make it good, if they want a good boss-rush, and that is the-
-Bosses: Yeah, this game isn't pretty good at this part. Despite being a boss-rush game, the mechanics of the bosses in this game is not well-designed at all. The bosses themselves ALWAYS have a hit-box on their body and/or their weapons. This could have made a good spacing skill game, but it honestly make the game more infuriating that anything else. Due to this, rolling forward and get behind enemies is also extra annoying, because rolls in this game is quite laggy to start and cannot be cancelled from your attack, plus you have to walk forward and potentially make you walk into the enemy's weapon. I hate this so much, it not only makes the game annoying, but also breaks my immersion. Yeah, you can't walk right into a blade, that'll hurt you, so of course just walk to the side of the weapon. Just because the game is 2D doesn't mean that everything in the game actually functions like everything is 2 dimensional. As for the attacks themselves, most attacks feel unfair. Most of them have no startup, so you can't really prepare to dodge unless you pay super close attention. They also mostly have no sound cues too, so listening is useless, and whenever the boss is off-screen, you can't know what they'll do. Does that mean this game is too hard? Well of course not, because you can buy healing from the shop, which costs very little and heals YOUR WHOLE HEALTH BAR. The game's difficulty is simultaneously unnecessarily hard and unnecessarily easy.
=H-content: like I said, the art and CGs is very nice. The game features some events as you go, and they are pretty cool. There's a good gallery mode, that can help replay some events. But the gameplay offers no H-scenes, as this game is a boss-rush. It feels like it's missing something, you know, playing a H-game with no in-game sex rather than events. And like I said, this game features spine animation, so yeah, animations during events is also pretty dry.
=Misc.: Story-wise, this game feels lost. It currently has no direction and doesn't really entices me into the story nor does it creates any sort of tension. The game's UI is good, but quite confusing at times. There's logs and skips for the events and dialogues in the game, but (at least as of right now) the skip button just doesn't work. This makes the game quite sloppy, and everytime I rematch a boss, I'll have to wait, and depends on which boss, it could quick or incredibly annoying.
=Conclusion: while it's too early to say for sure, I think this game isn't very good. I think that properly adding and reworking the game in several parts would go a long way. For where it stands now, I'll have to give this game a 6.5/10