Cool, relaxing game! At first I didn't really realize how to boost correctly, once I did, I realized how crucial it really was. The whole idea is very unique! I also like the art. The mix between 2d sprites and some 3d elements was pretty cool. I liked the addition of upgrades too, although I'm not really sure the purpose of the "boot" upgrade. Some clarification on that would be nice. But other than that, I got the hang of it! Good job :)