If you're still mourning the fact that Terraria won't be receiving even more additions, perhaps the appearance of a game that looks very much like Terraria on the distant horizon may be succour to you in these hard times. Take out your ocular device of choice and scan the distant land of 'unannounced release date', there in the valley of 'very early stages' you'll see Nioki Adventure. There are only a couple of screenshots to look at, the art style reminding me of Tontie. An emphasis on cooperative play and a class system differentiate from Terraria, while crafting and exploration of random worlds undifferentiate a little. Another picture awaits below.
More information should be with us soon and in the meantime, here's a quote from the developers about quests and classes:
"A defining feature of the game is the emergence of several sidequests (with one main quest) to encourage cooperation in completing challenges. The RPG aspect of the game gives to the player the opportunity to shape his character and personalize it with skills and specializations associated with that character's class."
I do enjoy cooperating on a good sidequest or several Now I just want to play Tontie all afternoon though, which is what happens whenever I remember it exists. A dangerous business this remembering. It's from Grow creator Eyezmaze and it's brilliant.