Oops, good question. I had to stop playing because it ended. :) Unlike last time, I saw it through to the end, and solved as many puzzles as I could, but didn't even dent the meta-puzzle when the buzzer sounded. Ended up just reading the solution. Yes, it's a fine puzzle, and I'm not sure whether or not I would have gotten it, given more time and interest.

I ended up kind of resenting the fact that the game expected me to work my schedule around it, even though it arguably wasn't too demanding. Still, I appreciate the ability to walk away from something for a few months until my interest comes back, and Planetarium doesn't work that way.