It's been awhile i've been dreaming with this. Cave Story is a cool game with lots of weapons, and i think it would work on SMBC. It's not NES, but it's 8-bit, as far as i can tell. Curly would work as a skin. Mimiga Mask Quote too. Enemies would drop energy pieces (don't know the exact name. The golden triangles. You would lose a level for the weapon each time you're hit. Idk if the weapons level would be unified or separate like on Cave Story. Anyway, it would be cool, what do you think?