Damn this was a good experience! The puzzles were hard and enjoyable while providing lots of aha moments. From a puzzle design perspective, this is the best puzzle game I've played. The amount of meta-level puzzles and puzzles that could be solved in many different ways truly makes this a legendary game.
I do have some complaints, such as the lack of a level editor and the difficulty in finding where to continue near the end. But my biggest complaint is that this is just way too underrated. Put this on steam and do some marketing! This deserves to be shown, and its definitely one of the best puzzle games I've played