I can see a nice little rhythm game here with cool music. The cutscene at the start is very quaint too. And once I looked up the controls I found them oddly easy to grasp. Using two separate hands helps me separate what button to hit for where. And if I practiced I could probably get good at some of the trickier bits.
I think there's a few things though that could definitely be added and improved but I'll just state this one. Messing up putting things in grayscale is an unfair problem when the player is somewhat relying on color recognition for what orb matches which lane. Instead I'd suggest making the ring turn red for messing up in that lane.