So it's a platformer with a bit of papercraft, nice try!
What you should consider is:
1) Allow a second jump at any time, not an instant double jump.
2) Maybe change the graphics a bit, but I personally think that graphics are not the most important part of the game, which is done during the short jam.
3) Please think about what is the trick of your game? Because right now it looks like an ordinary platformer.
But it's good work!