For the SDS. Arrow keys to move and jump: if there's a platform on either side of the "mirror" in the middle then you can jump on it. On the other hand, platforms in the real world might not exist if there's something off in the mirror... Look in the mirror for clues on where you can and can't jump!
Somewhat inspired by Nitrome's "Ditto", check that out if you get the chance. Music is "As the Clocks Tick" from the Spiral Knights OST by Harry Mack. (Feel free to try to interpret a story from this if you want, even though there isn't really any)