This game really is a little gem. I like the look and the feeling of being lost it conveys. The simplistic, repetitive architecture supports the various special shapes as interesting landmarks and got me curious to find more of them. I also really like the informational reduction and requirement to focus just on my senses without any kind of further advice. That way your game feels more like an aesthetic experience than a "game" in the classic sense. The fact that the enviroment is procedural generated and thus becomes my own unique experience gives it an interesting intellectual and artistic touch.
Personally I find the walking speed fitting; stairs are a little bit glitchy though sometimes and the walking sound feels repetitive after a while.