Keep in mind, this game *is not* Minecraft. The cartoony look may give a sense of innocence, but there is plenty of violence, nightmarish Lovecraft-ian creatures, crude humor(most references will fly over younger one's heads), and large difficulty spikes that will keep younger children from enjoying it. If you do allow your kids to play, keep in mind that this game is difficult and violent! The "Original poster" clearly had not put too much time or effort into the game.
There is a split focus on building houses for your NPCs("Non-Player Characters") who will arrive when certain criteria are met, digging(spelunking) to find treasure chest and ores which can be refined to create armor and weapons, and killing enemies to get certain items which includes killing bosses that get exponentially harder as the game goes on.
As far as which "port" you should play, go for the computer version if possible, it is the most up to date and often goes on sell for only $2.50 and is normally sold for $10. The console versions(Xbox, DS, and Playstation) are the furthest behind(they will be caught up with phones in Feb. 2016) and the most expensive being sold at $20, with phone versions being a bit more up to date and being sold at $5. There is no cross platform play available, meaning Xbox plays with Xbox, PC with PC, and even as far as Amazon with Amazon on the phone versions.
A few things parents could talk to their kids about is the creativity vs survival element in the game. "Do I decorate my NPCs house "waste" valuable resources? Or do I make their houses out of dirt and keep the resources to put to use elsewhere?" how can that be applied to real life? This may also be a chance to introduce teens to H.P. Lovecraft seeing that most of the bosses have a "Cthulhu" theme.