Cool art & idea! I felt confused by the colors since I didn't see any name tags on them, so I didn't know which tone of green was jade, for example. Maybe that's intended extra difficulty, but if it's not, a color in the codex directly would make it better!
The SFX were good for the gameplay, but they didn't fit the art style much (I'm talking about the cough specifically), perhaps editing them a bit would help. If you want to develop it further, you might also want to consider making it something visual too for more accessibility :)
Aside from these tiny details, really good job! It's a pretty complete game :)