I like your central mechanic a lot, I think it could really flourish if expanded upon. I also like the way it is kind of organically taught at the beginning. The graphics and all are of course a bit wonky but for a three hour game that's completely fine. Plus, you even added sound effects! One thing I do want to mention is that when you're touching the ground, the health should just replenish instantly, otherwise you're just waiting around doing nothing.
Overall a neat little game :D