Good game, but...
...it seems you've put the gold medal times for tracks 2 and 3 for the offroad vehicle too high. As of the time of this writing I'm the top time holder for both of those times (as well as every other time... I'm allowed to brag), by 2 full seconds for track 3 and by .1 seconds for track 2, and there doesn't seem to be any way of going faster, since there's no terrain to abuse on map 2 and it doesn't let you go around the palm tree on track 3. I'm 2 seconds ahead on track 3 but I'm almost half a second behind the gold time.
It's also rather easy to get hung up on the dunes or in the trees. If you end up there, you just keep spinning your wheels without being able to free yourself, which is rather inconvenient. I'm also not wild about how wide the turning radius is, and since it's the same on every car, how wide THE turning radius is.
All that criticism aside, it's still fun enough that I made it my mission to gold star every level with every car, so that should speak more to how enjoyable the game is than my prior complaints. Call it constructive criticism?