Just so you know, the "While GameRunning" always runs at 60 passes per second. Speeding the game up means seedlings move faster and trees grow faster and so on, but the AI will always "think" at 60 frames per second. So speeding it up technically makes the AI stupider!
I'd recommend running it at normal speed for an accurate simulation.
I'm running a simulation at normal speed right now, without actually taking any actions for myself, to check my AI will win. So far, so good. :>
edit again - removed spoiler !