Finally completed it today. I had to hit up a guide for hints on a couple of the puzzle pieces which was a last resort.

Overall, I'd say I was impressed with the game. It did a lot of clever things with some very simple gameplay mechanics.

Jonathan Blow could do some amazing things with the right team around him - if one of the major studios is prepared to invest in something risky but worthwhile.

Meanwhile, I hope he make some money  - it's well deserved.