I got this because procedural destruction is one of my favorite things, but this has gone beyond that to be one the best co-op games ever made.

Four classes all work in a synergistic way.

Gameplay loop is half zen mode mining, half repelling bug attacks a la Aliens.

Highly recommended even if you are playing without any friends, as the community is awesome and I've been having a blast since day 1 playing with randoms.

Really hope it wins the "Better with Friends" award this year.

2021 Edit: Developers still putting out amazing free updates. Game has more breadth than ever..