A very interesting and challenging map, which centres on a simple concept executed incredibly well. It really played havoc with my spatial perception -- more so than digs06.

Agreed. The map has a grand total of five monsters and takes not much longer to play but it's worth it. The truly tilted geometry sets it apart from other surreal/Escher maps with "impossible" geometry, but would likely be too much for a full map. I imagine texture alignment was a pain in the ass.