Did you get Mega Man 2?
That's right - Mega Man 2! My partner is a HUGE Mega Man fan and I previously transcribed one of the levels and arranged it for alto saxophone and piano for us to play together - Wood Man.
So I think, it would be a neat project to transcribe and arrange all of Mega Man 2. Is that too ambitious? 8-bit music seems like a good place to start. And if you haven't already heard the soundtrack, it's pretty invigorating!
And because I haven't actually played the game (I know, it's not ideal...), let's throw in some wiki character trivia while I'm transcribing and rearranging(?) these themes!