It's ok, but the main issue is that there's no real keyboard support (which really shows that rpgmaker isn't the right engine for this). So you basically end up just clicking the same button for the vast majority of the game. Then, all your progress is luck based. You need modification points, but if you get them is just random chance. You also need to encounter specific monsters to do modifications, and increase your point efficiency. Plus, there's no way to tell how many modification points you need to perform a modification without running into a monster that modifies that part. But, once you encounter a monster there's no way to spend your saved points to unlock the next level of modification. So you end up needing to memorize what the various modification breakpoints are. Then, once you get to floor 150+, you'll probably start enocountering monsters with a limited amount of modifications they can give. Basically? A lot of the time encountering monsters is just bad RNG. It'd be nice if monsters did something, like increase the number of modification points invested into thier body part, if they can't actually modify that part.
Basically, game should have been built in a diffrent engine (one more suited for a click-based interface). And it needs a few QOL changes (why are we asked if we want to modify a character? The answer should always be yes?) And there should probably be more actual choices involved, rather than just random chance.