It manages to be simultaneously challenging AND zen, which is quite an accomplishment. Your idea is original and executed beautifully. I really liked the colors you chose to use, the subdued music, and the overall environment.

I did have a couple of issues:

• A couple times, the game froze on me after I'd clicked a nova. A few more clicks here and there unfroze it, but I thought you should know.
• I could find no way to quit the game. Neither "Q" nor "ESC" worked and I ended up force-quitting. (To be fair, I may be an idiot who's overlooking the extremely obvious, a specialty of mine...lol.)
• I found it a bit too easy to confuse the cube and diamond novae. For me, it would have been more intuitive to make the cube a "plus" and the diamond a "minus" with corresponding symbols. (Again, to be fair, you may have had solid reasons for the cube and diamond.)

Overall, it's a fantastic game, and I hope you don't think me overly picky. :-)