Alter Ego is a clever retro styled single screen puzzle platformer with an interesting swapping mechanic. You control a blueish little guy and his phantom alter ego (that moves in a mirrored fashion) at the same time. Swap places with the invincible alter ego to reach normally unreachable corners and collect all the pixels to solve each stage.
The game is freely available for PC, NES and ZX Spectrum. Moreover the Chiptune Soundtrack can be found here.