I'm on the 2nd generation Touch with OS 2.2. Here's what I think the problem was: I was on wifi shortly before I tried out Numbrosia so my iPod thought it was o

I'm on the 2nd generation Touch with OS 2.2. Here's what I think the problem was: I was on wifi shortly before I tried out Numbrosia so my iPod thought it was online. I can reproduce this at home by turning off my wifi. It goes to the "Syncing with server..." screen for a full minute before deciding it's timed out, during which time it's non-responsive. I didn't let it go for the full minute before; I assumed it was hanging. I would have preferred that the app was responsive during that time -- touching would being up a "Cancel" option or something. I've also figured out that "Solve new puzzle" on the high scores menu is a button. In retrospect that should have been obvious but at the time my attention was focused on the "Tap row to redo puzzle" instruction -- I expected a list of levels to choose from. I guess you can write that one off to user error. I've played through a few more levels. The controls, which were awkward at first, are becoming more intuitive. You're right, solving lots of puzzles is easy once you get the hang of it, and the challenge lies in trying to match the world record score. My preference would be that the levels get more difficult to complete as you progress. I'm just brainstorming here -- maybe the player could only have a certain number of moves to complete the level in? That's kind of what it boils down to anyway, trying to match the world record. Aside from that I don't know how much more difficult the levels can get without changing something fundamental to the game mechanics. I'd say the game looks complete and polished as it is. The puzzle space is a crowded one where users are hesitant to learn a new set of rules unless they know it's going to pay off with rewarding gameplay -- and they often won't know the gameplay will be rewarding until they've tried the game. What I've been trying to do myself is to produce app after app rather than work on revising an app after it's out -- I've found I improve the quality of my output more rapidly by starting new projects from scratch rather than improving on already-finished projects. I look forward to seeing what you do next!