First off, congrats on getting the game submitted! The idea of building a path for the player and incorporating note-hitting as a mechanic is really clever and reminds me of classic creative games like Mario Paint. The challenge level is definitely high for just one level, which can be a bit tough for players, but it also makes the game feel rewarding once you figure it out.
The creativity here is great, and with a bit of balancing or additional levels, I think it could become even more engaging. Thanks again for sharing your game!