Pretty sweet game! I enjoyed driving around and drifting through the sand. And the secondary camera view is sick!
One of the things I found a bit difficult to know is how fast I was going. One of the fun aspects of this game is moving and drifting at quick speeds and so I think it could add a lot if there were more texture on the ground so that the player can visualize their speed. I only knew I was going fast was after going off the edge and flying through the air (maybe due to the lack of gravity since this would take place on another planet).
Overall, great work! I think this concept has lots of room to expand on.