I won't claim to have totally understood this game but I enjoyed fooling around with it, and it's kind of gorgeous in its minimal way.
A downloadable game for macOS
Silt 2 is my entry for the August 2016 Lisp Game Jam. It's a port/rewrite of my Ludum Dare 34 game Silt, from Clojure to Common Lisp.
The code is open source.
You can play it over telnet if you don't want to build/run it yourself: