Learn to fly is a game about a penguin who saw on "Kiwipedia" that he was a flightless bird. He didn't like it so he decided to prove that he could fly.
The comments are quite easy, you adjust the angle at which your penguin is flying by pressing the left & right arrows and the spacebar to use your rockets once you get them. there are several upgrades that will allow you to go further and faster; you can reduce your air resistance, increase your acceleration while going down the beggining ramp and increase it's height.
The game itself have several mini achievement that will net you some money to spend: every ramp have a flight length achievement where you have to glide for X seconds, a speed where you must attain a certain speed and a height one where you are supposed to go up to a certain height and one where you must go up to a certain distance.
Try it, it's quite a good game.