Yay I got to the end!
This game is simple but very fun and very challenging to play. I like that the walls keep closing in, and timing your button presses and moving at the right pace is nerve wrecking. It's quite impressive that a simple game loop can be that entertaining. And I like how it plays into the limitation.
Not to mention the way it was built, and how it was meant to play. I've been always fascinated with this kind of stuff, but I only went as far as playing around with an arduino a few years ago. I'm definitely giving you top marks for concept as this is super creative and as other people mentioned a very unique approach to a game jam.
If I could give a feedback, I'd say the game itself takes a few tries to "click" as the comet's tail reaches you very fast if you don't move at the beginning. So I'd move the starting position to one of the borders and make so the game starts slowly and picks up the pace after a second or two. I can say though, once you get the hang of it, it becomes extremely fun. It reminded me of those minigames like the FFX thunder thing (which is doing one specific thing which requires precision over and over again, making you eventually fail because your focus can only last so long).
Great job with this one!