Quite an interesting project, more interesting because it is made in Ren'py. I like the overall plot of the game and the monsters and what they represent, the combat is also really fun to play.
Obviously my only suggestion would be to give it a more unified graphic style, preferably not using assets from random people without the proper rights; If this is a personal project for fun I guess that's no big deal but if you plan to expand on this I suggest taking special care on that aspect.