Added a "rate increase" to both expansion and spawning. And, I made this configureable via the options.xml file. I also included a "NextLevelScore" in the options file. Now, whenever the level * NextLevelScore is met or exceeded, I subtract the rate increase values from the "time till next spawn / expansion" values. This means that the better the player does, the faster the game is.
I think I might distribute the latest version tomorrow for extra feedback.