Convert Corona Code to Unity 3D Code

We have kids app developed in CORONA SDK but needs to be converted into UNITY 3D for iPhone, Android and Windows Phone deployment. This is very simple app but will need some changes which we have already identified. Also, overall graphics improvement will be needed. I will provide sample files / images which needs to be used. I need these changes as soon as possible (urgent). Please note - this is not a game app but a very SIMPLE FLASH CARD app for kids. So please bid appropriately - I will ignore all bids more than certain amount.