This is a good start. I like the soundtrack well enough and the movement is kind of fun. Jumping around and shooting feels decent. I don't really understand how important the door thing is or what the win conditions are however? And the character sometimes gets stuck on edges if you jump on them at certain angles. 

Anyhow, the art style is fairly charming too and reminds me of old Windows XP games sort of.  And I think the banner of the "Door Overlord" is hilarious.

Decent entry but could use a bit more polish. I understand that jams are super tricky with the time limit though. Good start, keep developing!