We made the game in gamemaker, which doesnt have very good 3d support, and internally the game is still entirely 2d but with a 3d camera, and most objects with billboard drawing code. the internal resolution of the minigame set to 320x200, and the zfar set to really low. i think theres only one sprite with a hardcoded direction and thats the finish line. past that, gamemaker handles most of the brain hurting 3d math with matricies and such.
Glad you enjoyed our game!