One of the best I've played so far. The primary loop of matching 3 is basic enough, but it's quite engaging. The secondary loop of deciding what tools to build and how to sustain yourself was (as is usual in such survival games) very challenging.
I love couch co-op games (I made one myself with A Visit from the Very Tall Man!). However, in this case I didn't have a partner to play with, so I wished there had been a single-player mode.