Fun game and the artstyle looks great!
I did like the floaty movement though it could be tightened up a bit as it's quite hard to gain enough speed to hit enemies and then actually collide with them in time. The only other thing i could suggest is some item descriptions, even in the project page as i have no idea how some of the upgrades work (other than the speedometer upgrade but that's pretty obvious.
Other than that though, I very much enjoyed what I played of it!