The controls are really easy to use: press the left side of the screen to brake, and the right one to accelerate. You can also lean by using the accelerometer of your Android.
Those are all the controls you need to beat the almost 150 levels that make up the game, all of which are full of jumps, impossible loops, and dangerous areas designed to test your skills. If you're not fast with the controls, you'll probably end up flying off your bike quite a few times.
Although there is only one bike available at the beginning of the game, as you continue playing and winning stars, you'll be able to unlock new options. There are 18 different bikes for you to collect in all.
Bike Race Free is a simple but entertaining 2D racing game that provides more or less the same experience in its pro version except but you can't play online.