You are a prisoner for a crime you don't remember committing, and your only chance of escape is to draw a square circle.
Kafkaesque is a word many have used to describe this game, and indeed a sense of claustrophobia pervades the entire escape attempt. The writing is solid and sometimes witty; most visible objects were implemented. It was, however, marred for me with imperfect line breaks and the occasional "infodump".
Balance between story and puzzles was probably a tough call here. There is plenty of both, which provides for a rich playing experience, but the delivery of major plot points was often delivered as an uninterrupted chunk of text. Reading the 'infodump' like that broke the flow of the story and, for me, lessened the impact of the most major twists. The puzzles were well-hinted with contextual hints, and there are multiple solutions to some of the puzzles. Despite this, the puzzles are not easy. For me, solutions weren't immediately obvious and I often referred to the hints. I found it hard to find that moment of enlightenment when solving the puzzles, partly because there wasn't enough material with which I could experiment. Also, it seems to be possible to put the game into an unwinnable state, probably meriting its Nasty rating on the Forgiveness scale.
Conversation in Square Circle also merits some mention, with most topics of conversation given an appropriate response. As with Blighted Isle, Eve also includes some natural-sounding responses to topics for which the NPCs do not have an answer - a thoughtful, and also playful, gesture.
Square Circle is technically strong, with a well-thought-out story and interesting puzzles. There is a good twist towards the end, and perhaps could adopt a more strongly consistent tone, but well worth playing.