This game originally developed from my curiosity of physics in Flash. I eventually got the physics and collision detection to be good enough to work. I then decided to make it scroll vertically and I added in the visual aspects of the game such as the background, trees and suns.
The player uses the left and right arrow keys to roll left and right and the down arrow key to build up jump power. Release the down key to jump.
You can play it yourself if you click here.
It does have audio so make sure to mute your computer if you're in a quiet place.