This was a fun game. The difficulty should rise over time. Yet you're surrounded by enemies, right from the start.
The enemies spin and you have a number called rpm, but how exactly does that tie into "spin to win"? Instead of a dash attack, you maybe could have implemented some kind of spin attack.
Could do with more sound effects. For example, when dash becomes available and when upgrades appear.
The visual effects could be more cohesive. The fireball effects look nice, but doesn't quite fit in with the aesthetic for the rest of the game, for example.