It feels very stylish and well made, and I like the overall idea!
The win and fail states felt a bit unclear (how many Grems can you let through? how many deadbeats need to pass for you to win?), making the end sometimes feel a bit abrupt. Also, the timer seemed a bit short to me: by the time I really got into a groove, it would already be over.
Other than that though, I really can’t find anything to fault. I really enjoyed the game and found it quite charming.