I think this is a pretty good game, this is one of the only physics games i know that provides a good challenge, level 20 was my max. Although what Dimono so eagerly said is true, you sometimes shoot 30 cannonballs just to get someone.
I think i did find a bug or so, at level 7 it doesn't matter wether the pink ones fall out of the map or not, you can simply shoot them :p
''hostile aliens are allways green'' alien racism?
Decent physics game.
I have not had the severity of issues that others have. I would admit it got tricky, but it's not often games are challenging these days. Not a bad one.
Not to bad
I got to the 2nd level, it's a good game, not easy that's for sure. Music is ok, graphics are solid.