A Dark Room is a simple click-to-play game that I have found to be a great social language context for a number of my groups, at different age levels. It starts with just having options to stoke a fire in a cabin, then other characters and village-building opportunities arise. The gameplay unfolds just by text on screen following your choices, so it's a good opportunity for following a narrative, "thinking with the eyes," visualizing, and having group members take turns and add thoughts. It is also one of those games, like Little Alchemy, that engages students even if you don't/can't give cursor control in a teletherapy situation. 

The plotline of the game (I haven't gotten that far with groups) is a bit dark, which makes it suitable more for middle school/high school than elementary. If you would like to play A Dark Room with multiple groups, it remembers your progress in browser, so I am using Safari with one group and Chrome with another.