Box Cat is a retro arcade smasher for iPhone, iPad, and iCade.
The music was first composed in Garageband with YMCK's Magical 8-bit Plug. Then it was transposed into MML to create an NSF.
Blarggs's Game_Music_Emu is used to play the NSF in game.
Download the Box Cat Original Soundtrack from Bandcamp.
Rather get the NSFE? Sure, here you go.