As a software developer, I find it depressing that people would find 16$ (about 15 minutes of billable work?) too much for an application that, presumably, would be used all the time by people who need high precision pointing.
On the iOS App Store it's even worse. I actually heard a good quote once: "if your app is amazing, make it 99-cents. If it's shit, make it $2.99."
I'm not going to spend $14.99 on it because there are alternative products for cheaper or free. Demand will dictate the price, I simply suggested that 4.99 might be a better price point but that he should look at the data first.
Think about how much the Adobe Suite costs. $16 is not too much for this audience.
Nothin wrong with that, but it just seems too expansive for the effort it seems to take to make something like that.
Probably it's my inner optimistic programmer speaking, I can believe it was much more difficult to make this than I predict, but that was my first reaction - maybe it would be usefult to you to know.
Anyway, good luck. I wish I finish my game someday, and will have my shot at being entrepreneur.
BTW: for developer in small Polish city $15 is 2-3 hours of work
It seems to me that if you really want to experiment with this niche, price the product according to the value those customers will obtain from it.