This is a cool idea!
At first I would assume exponential would be in the sense of "exponential growth" (which you made literally haha). But in fact your game is kind of the opposite (exponential decay) since the possibilities are less and less. At least that's how I see it. In any case I thought this was a really interesting entry! Good job!

Loads and runs fine. I love the concept. Agree with Zen00 but for a jam it is good

Unfortunately you grow a bit too fast in this game. In its current state it feels like there shouldn't be a jump button, or a run button, you should just always be moving at full speed looking for an exit as fast as possible. The game likes to tease you by making you think the exit is right in front of you, but in reality its just very slow at loading the next section of the tunnel. While it is possible to win, the odds are stacked against you significantly.