I have to say that I'm really astonished by how good this game is (can't believe it's your first jam :P). I had a lot of fun playing it, but let's go to some critisizm.
Game design:
I have to say that it's really good. Love the menu (those little things like animated text really add a lot). Same goes for game, those bouncy legs, particles on death etc. made me really get engaged.
Art:
Very well done. Every element fits each other which is important and not that easy without an artist. Maybe graphics are simple, but very aestetic.
Gameplay
Very pleasant one. Controls are fine, level are very well made (good difficulty progression), sad I couldn't see ending tho.
Music:
oH i'VE WAITED TO COMMENT THAT. bEST PART OF THE GAME imo xD. Loved the sounds and this background music. Made me laugh a lot.
Overall:
Amazing submission, really bad you didn't make it on time to submit.
Good luck to you both!