As a colorblind I really felt the unlucky theme on that one. x)
The concept is simple yet cool, it works, and it's hooking plus the songs are catchy.
It may go completely against the whole palette difficulty thing but in these cases I'd love to see different shapes for the different note types. It really was to me not difficult but unplayable at times due to my colorblindness, but it's a jam, schedule is tight and it's hard to think about everyone so no worries !
Great little game, congratz !