This entry in Twiny Jam uses the 300 word limit and a endlessly looping structure (similar to It is Not So Much a Story) to create a landscape. It's remarkably evocative, and in terms of content, it's similar in spirit to vale of singing metals.
Singular is well-conceptualised and, like The Tiniest Room, makes full use of the 300 word limit. For its size, there is progress, of a sort. There is a world to explore in little chunks. Take a little more time than you might and you might discover something unexpected.