cool game and i liked the polished systems you put, the camera tour before race, podium after grand prix, race lap info, and the other pilots time after each race. The music fits the theme for me, and the change in the last lap is a nice feedback (i liked the change each lap in the map with day, night and afternoon transitions). This details add a lot for experience, congrats!
I could win just the last race, the first one was adaptation, but the second i dropped first position to last one in the last lap in a row of powers hit me, its normal in this kind of game i think but senses like i could do nothing for it and after each hit feels like i was send to behind my original position. This is more like a feeling than a fact, but when i am behind in the race feels like is already lost after certain distance to other racers, I do not feel the "rubber banding" in this game (that system which reward less the first pilots and reward more the last one to make than more close and keep the race competitive).
I played in browser, and in the first two maps it was more laggy, the night road was cleaner.
Cool to see your test map is possible to play