The gameplay is good; the effort put into the tutorial and level design is really impressive; the music suits the vibe of the game, and the humor works really well.
Only things that could use improvement: Movement feels a little too slippery in the game. In the tutorial, the turn rate seems much too slow (different than the actual game). Since you end up dodging enemy attacks and trying to shoot them when they are far away, they are little more than a few pixels, so might be good to have a consistent color for the enemies.
This definitely has the potential to be expanded into a larger game. Well done.