Osmos is a great game! It distracted me when I was supposed to be studying for mid-terms :)
I just have one suggestion--make it an option to control Osmos from the iPod Touch, kind of like Chopper 2. The controls could be tap to propel forward, pinch to zoom in and out, and flick to conrol time. I think that would make it a bit more interesting and fun.
Other than that, great game! Four stars!
U-R-4-giv-N about Osmos