The idea is good but there are a few little things that could be easily fixed to make the game more enjoyable.
1) at the start if you press forward before the coutdown ends you do not go forward once it reaches 0. (This could have been a design choice but I think it makes the player get hit at the start too often). If you wanted to reward the player for pressing forward just on time you could have given with a little boost
2) When you buy stuff from the shop the counter up left does not update for some reason. I couldn't tell if I was buying stuff until I left the shop and died because I had spent 10 times the amount of cash I had.
3) When you stop pressing forward the car just stops instead of decelarating. This means I can't slow down during a curve. The car stops and the cops can catch up very fast.
If you knew these were problems but didn't have the time to fix them it's totally understandable. I hope you find the feedback to be constructive. And good job on making a racing game with this limited amount of time!