I find it an interesting idea to make a racing game where you control the vehicle with only your mouse and your speed cannot increase, only decrease.
However the game had a problem with detecting my mouse movement at every beginning of a round and I am not sure if that is a me problem or a general problem, but it made the experience worse, especially when the whole movement is based on it, so I would be delighted to hear the reason why this is a case and if it is something you have to fix or I.
But besides that I had fun!