I am a bubble shooter/popper lover, so I have played a lot of these games on my PC, iPad and iPod. Bubblenauts is very refreshing and innovative and there is really value for your money in this game. You have to think before you shoot, but you can buy powerups to help you thru the levels. Only thing I miss is a complete help feature.
---> @moxiemoll You can change the bubble speed in options/gameplay.