A really cool idea with a great idea behind it which needed just that tiny bit of extra polish
The few sound effects in the game were a good indication of when you lose stamina though a couple of more miscellaneous environmental sounds would be appreciated (e.g the sound of traffic and the turn of the bicycle)
The bicycle is quite difficult to control. If you hold shift when you run out of stamina, you completely stop which slows you down a lot. Would love it if the bike had more heft to it, being harder to stop and slowing down instead of stopping almost straight away. I also found myself colliding of invisible objects occasionally A,S and D don't actually effect the movement of the bike so I failed on my first attempt because of the controls.
It was great that you included a controls screen at the main menu, but the text was tiny and didn't really give me a good idea of what I was doing. Perhaps a in game tutorial would be better? Including some floating text in the beginning of the race to explain what is what.
I really enjoyed the game and your passion for the topic was very apparent! Great stuff!