Game is great up until the Lily fight. It's not that it's hard, just that it completely walls off an entire playstyle that had been effective up until that point. Having to rework your entire build just to maybe handle one boss is a bit annoying, especially since you can't re-invest your points. Maybe it wouldn't be so bad if getting caught by Lily too many times didn't auto-lose you the fight, but currently if you've gone even a little bit down the corruption route it's way too punishing. Also, the design of the fight where Lily doesn't show back up until you defeat her servants can easily get you softlocked if you built a lewd-focused character because if you seduced them down and then fell into M pose, you can't break out of or progress M pose and there are no enemies to take advantage of it.
Regarding the impossibility of defeating Lily through her satisfaction, I think that's a great detail, even if the author didn't intend it that way.
After all, it's a logical ending for such a hero—to become a toy For Futa that will never be fully satisfied. Especially since rabbits are famous for their love of reproduction.)
On the other hand, it would be interesting if the game had a way to deprive Lily of her infinite lust, perhaps by removing some curse that makes her unsatisfiable. But I'm just sharing my fantasies.
In any case, the game has just entered the beta stage, so let's forgive the author for the unfinished balance.