Great!
First of all: Great idea!
There's way too little hardstyle on NG, so that's a good think already.
Nice song picks, and you really did a nice job on mixing them in, all HQ :)
Your mastering, it all sounded very nice.
I think it's a good thing that you kept using the same synths, since otherwise it'd just sound like a bunch of separate songs. But now it actually sounds like one song, with a lot of variety.
Good job! (Can you remind me when the next one comes out? :p)