Very cool concept!

I spent a while tweaking the code to get more CPU cycles, but after a while tired of mining the asteroids manually, so I just got rid of them:

  ENGINE.Game.spawnAsteroid = function () {}

After that the next logical step was to give myself more ships:

  SHIP_CPU_COST = 0.001;

Of course, it's a lot more interesting (and challenging!) to actually play by the rules.