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I was under the impression that the slice going to the creator is exempt from Apple's cut. That being said, there's probably no way (with Apple's APIs) to specify what %age is going to the creator, and what % is going to fees.
Perhaps this exemption only applies when 100% of the proceeds go to the creator (as is the case with Twitter's Super Follow)
Does Godot the game engine count?
I've seen it used in a pixelorama and some map modeling program. Also it's cross platform with c# support and gdscript pretty easy to understand.
I'm just here pumping web api's for my corporate overlords. I feel so bored.