Cool game, well done technically and gameplay-wise for an 8-day 'job'. Will definitely play more levels if they are made.
From the documentation side, it would be nice to mention the keyboard equivalents, for those (like me) who don't have a controller; thats 4 lines of text here or in a readme:
A (jump): Space
B (hold): Shift
X (shoot): Control
Y (open door): Caps Lock