2/10 stars (middling rating)
The platforming isn't rewarding, and the hit detection is so bad.
Usually in hentai games there's an paragraphed, telegraphed, animated pattern of attack before you get an "registered hit" on your protagonist, an animation of the protagonist flinching and then having invincibility frames.
In this you have flinching, but only if you're in mid air firsthand.
If you're on the ground and you touch an enemy? The damage is blink and you'll miss it. The I-frames are also incredibly lackluster to the point you'd probably want to modify that yourself.
There is no grapple animation or struggle mechanic either; meaning it's first come but second serve. Get defeated by an slime enemy? Ant enemy can pick you up and vice versa: what finishes you off doesn't get dibs, whatevers lucky enough to bump you when an enemy finishes you off does: and this isn't an implemented mechanic, it feels more like grave oversight.
You only have 4 hitpoints throughout an entire stage, combined with what I said above this is far from forgiving.
Also hope you like really far apart checkpoints, and enemies being in blindspots when you have to take leaps of faith.
The only reason this isn't an 1/10 (garbage rating) is because it actually has some decent sprite animations, but that isn't saying much at all when you consider just how bad everything else is. It's an slog, and it's a struggle. You'll be entertained for like 30 seconds, and then be enraged if you want to make any progress.
Want a good hentai game? Sorry to disappoint, this ain't it chief. Your only hope is it gets remade by an dedicated set of niche fans, the developer remaking it, or it being completely modded and overhauled to heck and back: even then? Wouldn't get my hopes up. You'd have to completely skeletonize and remake this for it to be anything other than a Middling Rating.