This was amazing! I didn't cold for 457.36 seconds, but unfortunately I had to stop playing. I felt that my issues were mostly caused by the placement controls — I'd accidentally place the walls to the side or on top of myself... I didn't mind the WASD-Space combination though, and mostly played with one hand. Perhaps having the walls place on top of the player instead of in the direction they're facing would be easier? In any case, although repetitive, the gameplay was fun!
Worked on Linux with Lutris and Wine lutris-fshack-7.2 :)