Demos are buggy and do not setup game loop correctly

[lukateras]

See: http://isaacsukin.com/news/2015/01/detailed-explanation-javascript-game-loops-and-timing

In Super Koalia if I jump long enough on a slowed down laptop I go straight through the block that I was standing on. Needless to say, on a 144Hz monitor the game would probably be unplayably fast.

Flappy Bird doesn't use delta time at all from what I can see.