Pretty cool puzzle, come and join! (Dead and gone)

Here it is!
Some answers are pretty obvious, some, well, may need a bit of research, but it's not a hard puzzle, that's for sure.
You know the catch, do not share the answers, do not leak the giveaway or the game given, if a hint is needed, I'll be the one giving it.
There also is a little extra for the winners (2) of the giveaway! ;)
And that's pretty much it! Good Luck, Have Fun!

EDIT: Checking if everything was in order, I realized that there is an error on the solution thingy that pops when you answer everything correctly, in the message that I left there, I meant puzzle instead of giveaway, just sayin'.
EDIT2: And there should be an "is" after technique in Q6, I'm ashamed D:
EDIT3: For some reason, Q1 got blocked, I'll just upload it here.

HINTS:
-Q1: It should take you a really short time if you check the steam store.
-Q4: Spam.
-Q5: Quick search on the steam store, really.