The short answer is: you "have to start from 0 again". The longer answer is: the game structures, levels, achievements, etc. are so different between the iOS and PC versions of Osmos (more details here: http://www.hemispheregames.com/faq-ipad ... c_ip_diffs
), that there isn't any meaningful way to transfer progress. The good news is: there are unique levels in both versions!