Of Light and Shadow

Of Light and Shadow is a fantastic little free puzzle platformer where you control two protagonists, each of a different element. Mr. Light and Dr. Shadow, each with their own abilities and require that your movements constrain within their respective names. Light for light, Shadow for shadows and the opposing element will hurt and eventually kill.

Mr. Light has the ability to jump and run while Dr. Shadow can walk on all non-destructive surfaces, move objects and drop from the current surface. The artwork and animation is fantastic with only a few minor glitches in the controls where Dr. Shadow was concerned. I would occasionally not be able to walk off a surface onto it's side but this can be patched easily enough.

While you are there check out their other free game The Balloon Quest, another platformer with a twist containing some truly amazing Disney-esc music and full voice acting.