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Not really, indie can mean two things; Low budget, or a small team of developers. Therefore not a lot of indies will have enough money to buy this...
Hmm, Maybe you could make a flare object, that just looks like a moon, so similarly to the sun there will be a flare on your invisible moon, it...
So, as far as permissions go, if I make a game using this asset, can I publish the game as long as I give you credit?