These are great! I bought several of your themes awhile back but don't see them separately anymore. I recall that the assets could be used commercially in any game engine with modifications allowed if needed. I'm using Game Maker. Is this correct?
The ones you purchased, yes, those can be used in any engine. You can use any of the tilesets included in *this* collection as long as you own RPG Maker MZ. You do not have to use MZ as your engine, but you need to own it.