I did not know you can throw out a hammer using shift, I only knew after ending the game(?) snipping this using windows+shift+s. The way I dispatched enemies was by dropping a crate payload on top of them.
I thought this was a good platformer game combined with just a little bit of puzzle using the bat dropping the boxes mechanic. Also I found out a way to make floating platforms by dropping two boxes in quick succession, the boxes are suspended in mid air allowing me to breeze through some levels haha.
Ideally, you could just put the controls list at the itch.io game webpage instead, so that the players could have a heads up on what to do. I was surprised to be controlling a bat at the start of the game and not knowing what it could do. *I see that at the moment of writing this, other players have already addressed these. Ah, Might as well post it since I've written it already.
Lastly, nice guitar music :)