These look awesome. Do you think you could extend them at some point? There are loads of stuff I think you could add that would also look great in this look =)
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First of all, sweet to hear ^_^ and I'm already planning a game in which I'll use these =)
"Loads of things" will always sound overblown. I guess more and different biomes, lava lakes, deserts, whirlpools of flames, giant mushrooms? I'm usually less in the scifi region of games so that's more my focus and style but this minimalist look feels just right.