Originally posted by RasaNova:

There is a lot of content already in the game, the last big update made several adds & changes, and there is a lot more still coming.

But don't by it for what it might be some day, buy it for what it is right now because it's an unfinished game.

Yes! and it worth it so much, solo or coop, doesnt matter :) This an early access game that beats the majority of complete AAA games from big devs.