Level 4 is super easy, I'm betting you don't know about the blue birds ability. If you tap the screen while the blue birds are in the air, they multiply into sets of 3s. I beat level 4 with one bird.
*sigh* I can't get it to launch, not even to a loading screen. All I get is a black window (with a lovely white mouse cursor, as if the system is lagging) and then back to whatever screen I was on prior to attempting to launch it.