Definitely not your best work. I can see this engine being used in some fun and interesting games, which is what pretty much everyone has come to expect from you, but this was not one of them.
I just found something cool - If you press 'Home' on your keyboard, a little box will pop up at the bottom, and you can type "spawn x," where x is whatever you want to spawn. Neat little extra.
I hate to say it, but I agree with Mimecitymayor... I can't seem to get any of the connections to work, specifically the portals... I only managed to get to level three.
You say "Excessive rebooting is not suggested, as the effect on lag have not been thoroughly tested." Well, I thought that I should say that I tested it, and it doesn't do anything, unless you're already lagging, in which case, rebooting makes it better.