Your game is beautiful, snappy and just the right amount of punishing! Your alien bunny is adorable, too. This reminds me of Super Meat Boy in that the levels are short, sweet and difficult enough that you'll rarely complete one on the first try.
I was able to collect all except for one star in the last level and I like the idea of the level gauntlet as well! The music accurately conveys the urgency and the graphics are gorgeous. Simple color palettes with options to swap the whole palette are always nice to see.
The gun feels excellent to use, being able to quickly turn around while you're running and shoot to boost yourself even faster feels amazing. I very strongly like the game and I think the level gimmicks you have so far, like the water and star gates work incredibly well. I'm very excited to see more!