Just to satiate your curiosity, here are the ideas I had for the later part of the game: 1. a power tile that replenishes your energy if you stand on it; 2. a tile that drains twice as much energy when you're on it; 3. a tile with a conveyor belt that moved it you in a specific direction, regardless of your input; 4. a button that creates a bridge to a previously unreachable area; 5. your doppelganger who appears in the opposite corner and mirrors your every move (you have to complete a level without bumping into him).