We've moved forward steadily over the last few days. Currently we stand at 97 puzzles, just a few more to go to break the three-digit barrier!
As of today achievements work for both Play and Game Center, and we fixed a few outstanding issues. The main remaining work is sound, and based on early work I'm quite optimistic about the results.
I've gone ahead and set up a Greenlight page for making a Steam version as well. We have a fully functional PC version currently and it plays well with the mouse, the main work we'd need to do is options for resolution and implementation of Steam achievements, so I have no doubts about being able to deliver if we're approved. Any folks that are interested, your support on the Greenlight page is much appreciated!