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I see that there are a lot of mechanics and things going on in the game, but I still haven’t found the controls. Do I need a gamepad here?

(+1)

No. I didn't make clear mechanics that you can control.
You can switch track on "orange arrows", boost works every 3 second. Try to concentrate on one car. 

Ah, finally noticed the control hints at the start of the game. But it seems that clicking the buttons with the mouse works better than pressing the keyboard :)

Two players at the same computer is great genre. If you add more obvious controls and booster readability, I’d try playing for two! Otherwise great job, I see a lot of detail implemented.