It appears that if you last closed Optia immediately after beating the first 100 levels, and then updated to version 1.3, it would crash the moment the loading screen finished. I've fixed this problem, and submitted version 1.3.1 to Apple. Apologies for the annoyance!
(Aside: If this wasn't the way Optia crashed for you (for example, if it crashed before the blue loading bar reached the top), please let me know! This is the only type of crash I've confirmed so far.)