This gotta be on the Game Boy
http://supersmashland.com/
I like it too, but it's not technically possible to have it on Gameboy hardware. The hardware couldn't support it, so many sprites flying around at decent speed. Just like RCR, it couldn't be made as is on the Gameboy unfortunately.
I don't mind playing it on PC though, same as RCR - whatever makes the better game at the end of the day.