Honestly the first thing that got me was how jank the animations are. Not in a bad way, like someone actually tried but the budget was three cigarettes and a dream. You know that Honey Select look, where everyone's skin is a little too glossy like they've been oiled up for a bodybuilding competition. It works though, especially when things get messy.
The horror bits are actually trying, which is weird because one minute you're in some creepy mansion with flickering lights and the next you're balls deep in a classmate who has tits the size of her head. The tonal whiplash is real. There's this one scene in the prison infiltration where the guard catches you and instead of game over you just... corrupt her? She goes from threatening to call backup to choking on it in like three dialogue boxes. Made me laugh out loud. The writing takes itself so seriously with the whole Astaroth conspiracy and saving the world nonsense, then throws you into a fully animated anal scene with a character you met five minutes ago. No buildup, just "the fate of the world depends on you" straight into "bend over." The mobile game tag makes sense, the UI feels like one of those gacha games where you're constantly tapping through menus, but the scenes themselves are decently long and loop smoothly enough. The masturbation scenes are whatever, bog standard stuff, but the corruption path with that one girl from the mansion, the way her dialogue shifts from scared to desperate, that's the good shit. Voice acting would've helped but you can't have everything.