This is an excellent idea well executed.
The least fun thing to do for sure, while somehow making it fun to do. I loved the art and the style, the gameplay was fun - when I lost I wanted to try again, so that's a great sign.
The only criticism I have is the jump sound was a little annoying after a while. If you are planning an update after the jam, the only thing I would change is add in a few variations on the jump sound and maybe pitch it lower.
But that's me being nitpick. So far this is my highest score for the jam. Nice work!