SamNeel's game Reviews on Newgrounds

[Evil Wing: Demo]

Not bad.

Not too bad for an unfinished game. As far as your bug is concerned, I've noticed that games that I've made have had the same bug. The problem was that people that were using versions of Flash Player that were earlier than version 5 would end up with their whole screen moving around when they would move the mouse. Maybe it's the same problem that's occurring with yours. You don't usually see this problem anymore as most people have version 5 or 6. The problem didn't occur when I played it but the game did screw up when I ran out of lives.

MetaphorcE responds:

it's not the ver of flash player... I *think* that it has something to do with holding shift down as the explosion happens. It tries creating a duplicate movieclip of a movie clip that doesn't exist in that frame.
It doesn't matter if you don't understand what I'm trying to say, just don't hold down shift after you've been hit... I'll try and fix it so it doesn't matter, but I think the problem is fairly deep in my code... probably gonna take time to sort...