interesting game. It took me relatively long to finish the level with more than 0 points, it was tough to don't get negative points lol.
I think that the game could have more levels instead of only one, and I think that different levels should have different mechanics, like stuff other than notes, notes you must avoid, note where you do something, etc, to make the levels more unique and different
It would be interesting if I could also get the songs from my device to put in the game too, and maybe save the songs
I also think that there should be an indicator of whether you're at the end of the level, maybe a bar that goes full when the level end, or a 100% marker, otherwise you don't really get to know how long the levels are, and if you're at the end of it or not