Very clever game. I still haven't gotten too far in it yet.
I heard about this game from Jonathan Blow. This game helped convince him to hire Jack for their current game, and Jack ended up doing a lot of level design on the game.
And then Jack passed away a few months ago, at the young age of 25. Jonathan Blow talks about it in this clip[1].
[1]: https://youtu.be/v_xdEIPZ2Po