The concept is cool, but the last team (not the original team) used an automated tool to hack the bank switch instructions. Unfortunately, no one went over them to make sure everything works (most don't fully play to the end). I started fixing roms in it, then realized it was a waste of time. The end.
But yeah, it's a novelty/proof of concept thing. The real kicker, is for hacking. Taking a single 'rom', you could hack that rom to load additional data/graphics/stages/tiles/etc. Or even add CD musics in place of the chiptunes (probably thee easiest thing to hack on this roms).