Great concept for the theme, playing as the stage of a platformer rather than the player. Really liked the visuals.
The little red spikes were really quite clunky, I wish the collision detection was disabled instantly on press because there was quite a long period where the spikes would still be active. Or at least they could stay down a bit longer to be less punishing.
Really fun idea. When you've repeated a level a couple of times and died at the end it can be a bit tedious to wait for the player once you've figured out how to get it across - maybe something like holding down SHIFT would fast forward the Time.timeScale?
Great game.