The floaty-ness is actually contributing to the game's difficulty and make it more fun, I am truly amazed. Overtime, I learned a more effective way to finish each of the stages. I can see a great potential in this concept, hope you expand more on this, I think it will be a unique experience.
My only suggestion is to implement a better endgame scenario, rather than to wait for the score to reach below zero, coz you get to the point where you cant finish any of the stage anyway, your time is too short. But thats just me, overall amazing entry, really good job!