Some issues with what you made
Tile sizes seems inconsistent, with most cheap WPs this UI will be extremely hard to operate under sunlight.
How can you have both Tiles, and icons and App list, if you are thinking like android and it's infinite home screens, then it's exactly opposite to what WP stands for.
You have music control both in Tile and notification bar, which will be even more confusing.
Some good things
MS needs to give an option to add OSwide background settings, some people like me, don't want just black and white. It gets real boring real fast.
WP needs an alternative Icons UI, it's a reason many android/ios users give for not using WP. A simple option in settings to choose Ex like Tiles UI/Icons UI will be very productive. More because Android, iOS and Microsoft's own and worlds most successful operating systems (XP and 7) use Icons and List as access to apps. Icons are what most people familiar with and comfortable with.
Icons UI might be the carrot and stick method for getting people to try Tiles UI, as they are eventually going to check it out once they own the phone.
Also those Music controls in tiles needs to be real quickly, it's a good feature folks been asking for.