I've just added a support for sorting layers. Should be no different from using same properties in sprites.
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Nice app! An idea to make it slightly more minimalistic and functional. Remove the "Hex" button and just cycle through different modes when user clicks on the code field. Show something like [RGB: 128,10,255], [HSB: 269, 245, 255], [HEX: #800AFF] and remember last mode that was used.