Its cool how you can use the bag as a weapon but in return it also damages you if you aren't careful. That's an interesting risk vs reward dynamic. The audio and overall polish was great. Only thing I can can criticize is the controls. I was very confused at the start, it took me awhile to figure out how to go down though platforms.
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You could change the go down platform key from (jump + s) to just s. Also might be helpful to add some other options for attack and interact like maybe the mouse buttons or maybe q/e. Honestly though the only real problem I had was that the down platform key isnt explain in the help tab so even just adding it there would probably be enough.