So, aside from a few grammar mistakes and all that, I actually quite like this. One thing that's bothering me though: The portal gun can only make portals on objects made out of/covered in ground-up moon rocks. It's actually a plot point of Portal 2. So why can Chell make portals on whatever she wants? I know it's a bit of a knit-pick on my part, but it's a large enough plot hole to bug the crap out of me. Other than that, good job. You've improved a lot since you started this, and it shows.