Use the left and right arrow keys to turn. Jump over the obstacles using the spacebar. Watch the size of the heart in the corner - it's your stamina. You lose it over time, and will have to collect the treats you find along the path to recover it! Be careful about tripping over the obstacles, they will make you lose stamina too.
Don't play in fullscreen - it makes it lag terribly. All sounds and images were made by me. Have fun!