Subsurface Circular
This short conversation-based text adventure is well-written and embellished with lovely visuals and sound.
However, it also quite monotonous. The entire gameplay is just a series of conversations, and while some characterization is revealed via dialog, there's very little character development. It's just one character after another. And there's only one location in which the entire game takes place.
It's worth playing if this premise intrigues you, but keep your expectations very low in terms of variety.