Port a game from iOS to WP7

I need to create a full port of an iOS game "Numberama" for Windows Phone 7. Here's iTunes link for Numberama: [login to view URL] Game mechanics and all features must be implemented in Windows Phone 7 Metro-style. Design should follow Metro style guidelines. Game should have nice smooth animations, and look professional. Code should be clean, preferable with comments in English on all public classes/methods/interfaces I would prefer silverlight implementation, but xna is also acceptable.