I thought it was great, I wish there was more than one puzzle in the game.

While this certainly is a functioning Jigsaw puzzle, I feel like since the game is fairly simple, it could have used a few basic additions, things like a timer and maybe a grid on the background as an option.
I also get the feeling that you may have other puzzle games like this one up on newgrounds, in which case I would maybe recommend just adding multiple picture options to each puzzle instead of uploading each one separately.
That being said, this is a solid puzzle simulator, and I don't really have much to complain about. I like the fact that you can choose how many pieces you want to play with, and the snap in function works pretty well. It is still pretty bare bones though, and I would have liked to have seen more pictures as an option.