This looks great! Looks like you've made a genuinely good game. Unfortunately I only have a 2nd Gen iPod Touch. Do you have any plans to release this as a Flash game, perhaps as a demo?
I have thought about releasing a flash demo, but I would have to purchase the flash exporter first. I'm not sure how much more I want to sink into this game. If sales pick up and it looks like I could make a bunch of money, I'll probably be willing to spend more to promote it.
Down the line there will likely be an android version, and if mobile sales die completely, I'll look into releasing it on steam or some other PC download service.