Thanks very much, glad you enjoyed it.
Apologies for Chapter 2, I know they tend to wander off a bit which can make the last one annoyingly hard to find (a bit like the original Command and Conquer haha), and I've blocked them from moving to the sandbag areas (though they can still wander inside the building up to the steps, then they are blocked) but they are all still killable and chapter 3 does load. I'll see what I can do about making Chapter 2 a bit easier.
But here's a tip, when you start the chapter get to the marker quickly and you can camp their spawn point.
I can't say I noticed the player moving any faster diagonally (unless moving along walls) but I'll take a look at normalising the vectory. Thanks for the tip.
Cheers