I really like this game. It's a neat idea. I like the idea of two endings, even if I forgot the last room code and have to replay the whole thing to try again. I also like that the leaf carries over if you choose the bad ending. The puzzles are pretty simple for me, though others seem to be having troubles.
The numbers puzzle in the third area is actually simple once you get the right mindset. Any lever you pull will give you a random set of two numbers. These are literal coordinates (32 = 3, 2). Go to the room that they correspond with, pull the lever there, and repeat until you get five correct.
Example: First lever is 54 = 5, 4; Second is 23 = 2, 3; 31 = 3, 1; 22 = 2, 2; 15 = 1, 5; Return to 0,0 and press the button.