The enemies are a bit too fast to survive without using strategies which felt like cheesing the game. I realized I could run a lot farther than I expected to, this is not a bad concept though! I would experiment with the movement mechanics and shooting mechanics, adding little particle effects and screenshake and whatnot can go a long way in making a game feel great to play. I would also be quite careful when designing floatier movement controls. Other than that though, not bad :)