Hello! I really liked your game and i'm now making a port to the psp! my art skills are rather clunky, and coding in C is kind of painful though... but that's alright! 
i hope that's ok with you!
yeah... some colors don't really display properly in such a low resolution, even worse in real hardware, so i had to make-do with this one. i hope the actual tiles have enough resolution to display the proper colors! i wonder how hard would be to implement the chord reveal mechanic... i've got a kinda prototype for the main game, but i haven't gotten around to implement that.