This is a very well-done game, I don't think it 'rips off' WarioWare at all. Just because it's similar doesn't mean it's the same. The whole experience is seamless and the boss sequence is awesome. I haven't beat it yet, but it's fun, so boo haters.
Enemies definitely fire one or two shots after being destroyed sometimes. I'm a huge fan of the author's flash animations. Definitely worth the trip to his homepage.
I like how you're continuing on the 'Cosmic' theme, with the gravity and planets, but, instead you're a ship flying through a solar system now. I particularly liked the level transition animation, and when the little particles collected on your ship. Very fun.
Actually I liked the progession of difficulty in this one, it was fast paced and it had neato effects, so kept me interested longer than the typical mouse game. Nice.
Hmm.. thought you should know, sometimes when you die and there's an animation graphic still on the screen (friendly agent's mega-lasers, and the water spray, for example) the graphic persists after you die and even when you start a new game. Minor bug, but really annoying.
Any game where you fight godzilla gets automatic points from me :) Nice story element, variation of levels, and overall gameplay. You could add some more power-ups, how about that laser your allies have?
 "Cannon Bods"){kind=icon}
 "Flying string defense"){kind=icon}
 "Four Second Frenzy"){kind=icon}
 "Astroblaster"){kind=icon}
 "Elasticity"){kind=icon}
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 "P.O.D."){kind=icon}
 "- Circlo -"){kind=icon}
 "Punk-o-matic"){kind=icon}
 "Desktop Tower Defense"){kind=icon}
 "Balance Balls"){kind=icon}
 "Bubble"){kind=icon}
 "Line Game"){kind=icon}
 "DreamCatcher"){kind=icon}
 "Agent Wing Defenders Final"){kind=icon}