Graham Bolton, author of the game Mekaphobia has started a series of tutorials on getting your game into the Windows Store:
"This is the first in a series of tutorials aimed at the Phaser development community and documenting my experiences during the development of Mekaphobia. The aim of these tutorials is primarily to give something back to the community as without Phaser itself or the wonderful work of individuals producing plug-ins and offering help in the dev forums the game would not have turned out as well.
Originally I intended to make this a pure set of coding tutorials to help other developers use Phaser to create games and avoid issues and pitfalls; However, when I posted on the forums to announce the release of Mekaphobia I was contacted asking specific questions about how to get a Phaser game in the Windows Store and my experiences with Steam Greenlight."