The puzzles are absolutely fantastic. My graph theory is a bit rusty, but I'm convinced the last one is a lie, and that there must be another one in the maze. However the maze is a bit abrasive, just following the classic minecraft spelunking hug one wall technique. Its not that interesting. I do like the fog effect, good eerie feel. Put in some mouse look and maybe a sort of abstract map that parallels the puzzles and this would be great. Seriously the puzzles are fun.