It wasn’t. It’s always been Patron-only, to add more incentive tiers. If you got a free version with a gallery, it was either a mistake or leaked.
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Actually, when I first made the $10 tier on Patreon, I put a a build up here with the image gallery to let people know what kind of perks they get for supporting on Patreon. The image gallery with be a part of the final build of the game, but that will not be free either (unless supporting on Patreon).