Very cool and creative game! Was a lot of fun and once the slower rings got involved also pretty hard. My biggest pain point with the game is that the samples you used for the drum kit are a bit ear-piercing and kinda low quality. I had to turn down the volume when the hi-hats started coming in because it was a bit rough on the ears. I think having some more pleasing samples could really benefit this game.
Anyways, good game, would play again.