I played through the demo and found the game to be quite enjoyable, though I did encounter a major bug. The game becomes softlocked if you try to select chimera genes when you don't have any traits to choose from.
Viewing post in Monster Souls: Chains of Chimera comments
That does indeed seem to be the case. I've done further testing and not encountered it on most other aspect ratios, albeit I have enough experience in coding to know niche cases are to be expected. As a precautionary measure, it might be good to add a keybind to forcibly close the menu/shop during playtesting, but overall you've done a very good job avoiding game-breaking bugs.