The pixel art is really cute, but it's hard to read due to being so small. I would suggest a change in the field of view. Zoom in so we can see all those cool pixel details you made! I found the jumping and falling mechanic to be interesting, and it is implemented well. The enemy AI is more than adequate for this game.
You did very well for the short dev time!
Did you enjoy the jam? Did you learn anything new or practice your skills?