I'd get premium edition if it was a stand alone game, no web browser required. Web browsers have a history of wiping my flash games and it just ain't worth it.
Design Flaws:
The fast forward button. Make it on off, no click and hold, its ridiculous.
The lack of graphics settings. I'm sure even those with the best possible computers get lag eventually when you start getting up into the 200th rounds...
The kreds. If we wanted to pay for games we'd go buy them and get a hell of a lot more for our money. This is why we're playing these games and not pay2play games, they're free.
 "GemCraft Labyrinth"){kind=icon}
 "GrindQuest"){kind=icon}
 "Bloons Tower Defense 4"){kind=icon}
 "Elona Shooter"){kind=icon}
 "Shopping Cart Hero"){kind=icon}