Err?
Is this your first flash? Because it's pretty good if it is.
Some things you should change, is to make it so you can't fly through walls, that was realy strange. Also, some sound effects and/or music would be nice. Perhaps you could lower the alcohol comsumption of that drunken fly? It's nearly impossible to steer.
Maybe you would want to add powerups or something, such as a laser to shoot zombie flies?
A good game overall.