Nice little entry! I love the player movement, and the shooting feels really smooth. The sound effects fit the game really well—I just missed some background music. :D The main menu was cool as well.
A small suggestion if you plan to continue working on it after the jam: consider making the enemies move in the direction of the bullets. Also, introducing the wall jump more clearly would help—since it took me a while to realize it was there. :D
Awesome job once again!