Cryptark is a new game which I'm interest but Early Access means I won't bother with it until it's officially launched.
It's not I think the game will flop or not be delivered, but Early Access games are obviously unfinished and playing half of a campaign and waiting 6 months or more to finish it is a big gaming blue balls.
There is also balance issues. When I played Mercenary Kings many of my favorite weapon combos got heavily nerfed so when the final version was released I always felt I was playing a worst version. Had I never played it before I would probably be happier with ther version I had.
I'll very probably buy it but I think even if I got it for free I would not play it unless the game was very close to completion.