I hope you know how to play Flappy Bird (use the mouse or space bar). Notice a pattern? I apologize for the lack of a smooth engine. It works, but it isn't as smooth as what you're wanting. But you don't always get what you want in life.
The entire engine was made by my friend, @maxn990. He's awesome. Credit to Flappy Bird (by .GEARS) and Google, who created Chrome, which created Chromasaur Visit the Chromasaur Studio to have more fun. In case you need it.
