Really cool take on the Sonic formula. I know every has mentioned the Kirby/Megaman/Sonic influence already but DAMN it's really cool taking such phenomenal aspects (Kirby moves and abilities, Sonic movement and speed, Megaman... x abilities kinda?) and putting them altogether for a playground to blaze around in.
The tunes were godlike, the boss fights are some of my favorite in a Sonic-like game, and the gameplay was really fun and satisfying. My only gripe is the dialogue (a lil iffy, sometimes weird) and the enemies in the second half of the game. The enemies especially hamper the later half since they're everywhere and stop the flow. I just want to run through things but it's constantly stopping me to fight enemies that have a lot more HP or are just too hard to fight without taking a hit (since your moves can be pretty slow). I think it slows down the pace of the game, whereas the first half is pretty great with when it wants to stop you with enemies.
Worth a shot if you're a Sonic fan!