Open index.html in your favourite browser.
Click once to start the game. Click to gain altitude. Avoid the obstacles.
This is a JavaScript port of the original game which is written in Lua and runs on CrankStoryboard. The Lua source code can be found in the original/ subdirectory. While Crank Storyboard is a great piece of software that runs on many operating systems, it is nonfree, so I deemed it necessary to free the original game from the shackles of its closed environment.