You can test it out here: http://shredsauce.com/cowgame/ Arrow keys to control the UFO and space to beam up cows. I'm happy with the mechanics of my game. It's just that it gets boring after a few seconds. Right now, the point of the game is to beam up cows to use as "fuel" for moving and using the beam. The fuel also goes down even when idle. But there's nothing to make the game more challenging as time goes on. Most games either speed up, or things get more difficult. Any ideas for a difficulty curve for my game?