Here's my 3 keys, enjoy:
RBVK-DCFH-QMTY
DHPR-MVVX-KKQC
LMDP-DLPT-LJCM
Post when you take a code and I'll check back in a bit and cross off the used ones.
I only applied about 2 weeks ago and I got approved after about 4-5 days, so the wait isn't too awful even without an invite. I've been playing pretty heavily for about a week and it's still interesting, although I don't know if it will hold up over the long term. Still, 60+ hours of gameplay for free isn't bad at all.
I played the campaign up to about level 9 with just the starting team and upgrading mainly with stuff I found, although I did buy a fair amount of cheap stuff to fill out the characters early on so their attack types would better match the buff in the skill slot. I mainly went slicer for the fighter early on, spark with the mage although I tried out fire a bit later and it would have made some things a lot easier. The cleric mainly to heal and buff the fighter although in a few combinations of equipment he could be reasonably good at melee.
Then I alternated with multiplayer, the 1st few MP games are against the computer so it's a gentle introduction. I played 120 MP games so far and won half, using just the starting characters and gear I won from the campaign and MP wins. It's fairly easy and well worth playing enough to win the 1st 2 or maybe 3 yellow chests each day, you can get lucky and find some pretty decent gear. I only won through to the purple chest once, it killed most of a weekend :p
If you don't like the basic team you get for free in MP, the cheap way to get other characters is to buy them in the tavern in the campaign for 10 gold each. No pizza required, but you don't get the items that would have come with buying a team from the Starter Pack Store. There are some niiiice items in those packs, but I'm hanging on to all of my pizza for now. Even if you don't think you'll do much multiplayer it's worth buying the Starter Party because you're given the pizza to buy it so hey, free items.
Anyway, good luck guys.