Had the same problem that other guy had at level 18, at first. It's very possible to clear out all enemies there and then the game just hangs, not recognizing the level as beaten.
What worked for me was kill the upper-right-most enemy first. Only then should you kill the center enemy. Then the game registered that level as completed. Not sure if this'll work 100% of the time though.
Not bad. However, I like to be able to zoom out and get a better view of the situation. It helps with the lining up of the shot. Can't do that here.
They are also harder to kill than Angry Birds.
Level 18 broken. I complete level 18 but ıt doesn't pass level 19.
Just like 'AngryBirds'
To those of you that keep calling this an Angry Birds rip-off, has it ever occured to you that this might be a reference, or a parody, of it?