Sometimes there are multiple ways to complete the puzzle, but the computer only says one is acceptable.  I comment in those, and hope they come out, but some are really tough. 

 I like the ideas behind it, but they really need to open up the right responses, since we all know there is more than 1 way to skin a cat, and some of the puzzles have multiple correct answers that aren't accepted.

 Still, great job!  That's 2000+