That was lovely :) However, I think something that frustrated me very much was how large the enemy hitboxes are... In general, enemy hitboxes should ALWAYS be smaller than their sprite is, so as to help the player and give a bit of grace. Other than that, the art made me laugh at each planet's expression :3 The distance between health packs seemed a bit too long sometimes, but I think part of that plays into how large the enemy hitboxes are, and how much I hade to swerve to avoid them.
Keep up the good work! :D
~ Adam "PixelDough" Worrell, from the Duck Jam team