When your startup screen includes "If the app locks up, reboot your phone," you obviously have a memory leak in your app. Also, I completed levels 16-22 several times but when I would go to resume the game, on the menu it would read that I was on level 22. However, when I resumed the game, it booted me all the way back to 16 every time.
I even went to the support site to report the bug, and the site errored out submitting the form!
Test, test, test, you guys.
AmyElk3 about Touch Physics, v2.4.0