This was one of the few games I played ahead of the deadline, because the splash art intrigued me. I ended up 100%ing it! Had a bunch of fun. Towards the end I was so fast I had to deliberately crash into the ground in order to not win the game before I could finish buying out the shop. Despite that, I think the upgrades are well balanced. I guess the art is all by you? Lovely aspect of the game.
Btw: during my first playthrough I launched myself to the left just to see what would happen (and because the game allowed it), and I ended up falling out of the map. It's a game jam, we're here for the rough edges and all, but if you want to polish this a bit more and being this silly had never occurred to you, I recommend restricting the launch angle (or putting an invisible wall).