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the resolution of the textures could've been preserved with "Point Sample" than to scale them up to 4K resolution with "Nearest Neighbor", or alternatively scale them up to a smaller resolution (i.e. 256x256 / 512x512) while keeping point sample. that's more optimized and less space-eating compared to the method you're currently using.
i noticed that two big deltarune maps here uses exactly the same method i mentioned (though the card castle map uses 512x512), which they save space than this. you should do the same with the other maps you have, not just this one.