A little rough around the edges, but with some cute pixel art! This has some potential, but I think one more pass would help bring it out. Still, you can be proud for getting this far in 48 hours! Maybe a Game V4? ;)
I often only got the powerups just before I killed the last enemy, which meant I didn't get to enjoy them as much as I would have liked. Maybe they would have more use if the enemies kept spawning in the same room, rather than being restarted in the level.