Turbo Kids is a free game (though packed with micro-transactions), which sees you competing in a number of races against a group of 'turbo kids'. There are a variety of game modes, but the core premise sees all the kids starting in relatively the same position, then competing in a race to the finish line.
Along the way you can collect powerups, shoot your opponents to stun them, and jump (or double jump which is always satisfying) over obstacles. The goal is obviously to finish first, as you compete in a variety of tournaments and game modes.
Although the micro-transactions might be pushed a little too hard, this is still a fun free game and worth checking out!
In the words of the developer:
Partake in the crazy Turbo Kids tournament and win the ultimate prizes!