transformation? (Race change type stuff). Size difference. Movement, make it feel smooth, maybe a walk cycle?
(This one is more a “hey, maybe get inspiration from.” Fear & hunger. Not exactly, but you game sorta has that aura. A more lewd version?
Improve level designs. Even by using free or bought assets to save time (That is just a suggestion towards game development. You can do it alone, but not alone-alone. You can always use premade assets for levels.) (If you ever want to go back and redraw them yourself, you can, but sometimes they work.)
Good luck! English isn’t my first language, monkey sounds are (I am being ironic on monkey)
I also suggest lonarpg & other roguelikes, not the game style, but it’s combat style