Won't lie, I didn't have high expectations for this game given the slow progress and the sense that zell23 was wasting his time doing animations for it. After playing the game... I couldn't have been more wrong. Holy fucking shit, wrong to the max. This damn game is pretty much everything I could have dreamed of and more besides.
The story, somewhat ironically for an action game, isn't bad - nothing too special granted but it's very much a character-driven story with generally well meaning individuals, and their affection for each other and the MC shines through despite the atrocious machine translation (there's a better trans in this topic, page 3 I think?). The MC's big sister does really seem to care for him, characters justify their actions to varying degrees of sense, etc. I thought it was pretty cute. The story has a pretty clear progression from start to finish, it doesn't feel rushed or drawn out.
The gameplay, VERY rare for a h game, is genuinely good - it's a bona fide action game through and through, with tons of unlockable skills to string together increasingly spectacular and lethal combos of flashy skills, most with a good amount of player control and a wide variety of options. I personally found a lot of the ranged skills to be less effective than the melee ones, but still usable. Enemies have EXTREMELY varied attack patterns, much like a proper bullet hell game, and most of their attack patterns look /fantastic/ as well as forcing you to react very differently. Special props to the Automaton, the first boss, and the final boss for having some REALLY fucking cool looking attacks that honestly blew my mind seeing in some japanese H game.
Unlike zell23's other work, capturing girls and getting the hentai is consistent and sensible - win the fight, get the girl. I really liked the consistency and the rewards were absolutely worthwhile; the game has a good sense of difficulty, it's not actually that hard but enemy attacks look threatening and they can fuck your shit in real damn fast if you're slacking, especially in groups. I never felt there was an unfair loss per se, but fighting large groups can be pretty brutal, so fair warning. I will say that by the 6th copy of a girl banging her gets a little repetitive, but that's how you get stats, and it doesn't take long, so eh.
The porn content, AKA why we're all here, is fucking phenomenal. There's a wide variety of girls (20 ish?) and each has 2+ animations you can switch freely between once captured, though on my 8th time fucking a new fairy I was hoping for more than the default first-fuck animation. Still, there's a good variety of mostly-vanilla animations; plenty of cowgirl, blowjobs, missionary, paizuri, and standing fucks of various types, along with a smaller amount of footjobs/handjobs and some pretty unique animations for some of the more unusual girls like alraunes, fairies, etc. Some of the 'normal' animations have cool takes; in particular there's a surprising amount of variety in blowjobs and paizuri that I really appreciated.
Overall this is an enjoyable game in its own right, and an EXCELLENT H-game that I cannot recommend highly enough. The only major issue with the game is that it ends, 'cuz this thing is a fucking work of art!