You are a squirrel, you want an acorn. Grab it by jumping through ramps and loopings.
There is only one control: Dive. Touch (or click) and hold anywhere to dive. You can use the space bar as well. When you dive you fall faster, use this to build up momentum to fly higher! Reset using the reset button (top right).
Press the pause button (top left) to pause the game and get more options.