Minecraft can get surprisingly addictive @Marc_Carlyon, I’ve played it with my son and what seems like minutes turns out to be hours! “I’ll just finish the roof”… “I’ll just do these stairs to the mine”… “I’ll just collect some resources for next time…”
Regarding more adult content… you can play voyeur and watch the animals, well, you know, make little animals 
My son loves playing it in creative mode, but I’m more about having the threat of the mods… I think what it lacks really are some form of missions… that could make it interesting…
Planetbase is pretty cool - on Steam etc…