Thanks for the detailed feedback, and I agree with it all! One criticisim I've heard over and again is about the shot timer in the last level. I really should have added a time-speed slider for that. Slo-mo would help in some of the earlier levels too.
Have you played the turn based Peggle yet? That's the most interesting one from my perspective!
The cannons not being synchronised is deliberate in a couple of the levels. But not in others. That's a subtle bug that could take days to track down. It's definitely my fault, but I knew I wouldn't have the chance to chase it down. It behaves differently on different computers, and between the editor and a build.
Don't worry about picking those nits. Even if I'm aware of them, they're really constructive. I welcome feedback!