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Yes, the Android version of the app supports live wallpaper! Unfortunately iOS does not (yet) support live wallpapers.
Unfortunately the dark mode in Android 9 (Pie) doesn't work with third party live wallpapers (such as Living Worlds). Android Q's dark mode does, however.
Joseph's demo actually uses modified versions of the original Seize the Day art; Wizards of the Coast and Acclaim Entertainment commissioned updates and expansions to a few of the images for their game Magic: The Gathering - Battlemage, and those are the images Joseph used. There isn't a complete set of 12 months in that size, however, nor are any of the overlays made for that size. Because of that, and to as faithfully as possible re-create the original Seize the Day worlds, we're using the original graphics.