Great game! It was fun and you nailed the theme!
For your first jam, your work is impressive! It's all so polished and I found the core gameplay idea simple and clever. There is a perfect balance between risks and rewards when you try to go faster.
However, I found a very simple exploit. I can just spamming spacebar and I can't lose anymore :P You should make that if you press spacebar when the door is closed you lose time or something similar.