Was having the same issue as others, really low initial acceleration and movement speed that makes the game practically unplayable. Fortunately, I managed to find the fix, which is to press the E key a couple times.
Once I got past that, I had a lot of fun driving around the simple but good looking levels. However, I still had some issues such as not being able to drive up ramps and the car getting stuck on seemingly nothing. From experience, 3D environments can be quite finicky and difficult to implement, so I’m glad you were able to get that mostly working!