I present to you: My first venture into publishing a Universal App (for Windows 8.1 computers & phones)!
My publisher and developer name is Saelia, just like my twitter handle, @Saelia. You can search for this in the stores to find my apps.
Link to download "Sarah Says" app for the Windows 8.1 (computer) Store:
Link to download "Sarah Says" mobile app for the Windows 8.1 Phone Store:
My app features the following software:
Windows Store Image Processor (WSIP) built by Adam Tuliper: http://adamtuliper.com/WSIP/publish.htm (Credit to Martin for introducing me to this) to make it easier to produce icons the right dimensions for the Windows Stores.
Or, if you don't want to have to install anything, Sertac Ozercan told me about this time-saver http://wat-docs.azurewebsites.net/Tools that also generates images specifically made for WAT apps.