I say it's a cross with Indy Heat and Super Off-Road
It has heights, it just happens that in the screenshots you can't see that properly. Today I've made a muddy track with some crazy jumps on it, it reminds me Super Off-Road. Look at the screenshot
Unfortunately, there's no net support.. you can have up to 6 players in the same machine (What about 2 on keyboard, 2 on PSX controllers in the serial input, 1 on the normal joystick and other with an USB joystick?
And yeah, that would be a perfect game for the "Small Sprites" thread