Neat, you could try a generative test checking that you can get from one point in the maze to any other point

I'll give look over the code after work for you

A simple test would be checking that all squares have at least one "open" side

From playing around with go blocks and multi threaded tasks in the past my advice is to get a serial process working first. Concurrency even in Clojure gets tricky and hard to debug very fast 🙂