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8 hours agojust to give another reason: proving the software is safe.
Basically the entire reason why F-Droid apps are all safe is because the code is easily checkable.
But i still understand why someone wants to go proprietary. Just wanted to add that reason
you could offer the game on itch because they allow to add a tip (and an optional minimum amount). Most platforms also dont stop you from oss+paid and even with being propritary+paid there is no guarantee people will buy it or when that you break even.
You could also try to sell the game for the first years and then open source it when its either clear that nobody pays or when it did make enough money.