Nice game man! I especially like how hitting a rock results in a leak that actually provides some thrust. It was challenging playing alone, so I can't imagine how hard it is playing co-op.
When I saw the cover of your game I was quite hesitant to play it, because it didn't look appealing. However, the game was actually a lot of fun and from the top down perspective the 3D models look fine. So, I would definitely advice you to change it to one of the top down screenshots.