I've finally submitted my second game (http://www.newgrounds.com/portal/view/619578). Mostly it's the first game, but with some fixes. The major bug was that there are plenty of 8-puzzle solvers, so it was pretty easy to cheat. That basically nullified the medal achievements for honest players. That's why I used original field.
Another concern was the lack of preloader and rather slow and boring beginning. So I've added the ability to skip easy levels and get to hard ones fast.
I know that people asked for music, but honestly - it would bloat the game size significally, even when using 64 Kbit/s low quality sounds. I have some ideas how to overcome that, but frankly - it's too much new ideas that resulted in that submission. It's hard to concentrate on something when there are too much new ideas, one better than another. That's why I forced myself to finish this idea of mine, so I could spend time on others.
Sorry if the game came out rough, buggy and unpolished. I am really busy now with more pressing matters, so it was "now or never" type of work.
P.S. I would like to thank all the players, who spent their valuable time on my game(s) . Thank you for warm reviews. This game would not be possible without your feedback.