Creative fun! I spotted a few small potential bugs while playing: the 'saving game' message displays behind score number after a finished game, when playing with a clone the combo goes down even if just one clone dies, the magnet seems to draw coins to slightly above your head so you have to wait or jump to catch 'em, the character hit area is larger than the character when they're minimized (can be seen when a clone stands on the head of the other, and there's plenty of space between them) and after the first riches upgrade the coin counter sporadically shows flickering decimal values while collecting.
Overall though this was a fun play, challenging if you want it to be but not so difficult you get annoyed or tired of it. Plenty of upgrades, awesome graphics and a fun idea too. Nice work!