just buy it for the first time? Will the following update versions be free or have to pay extra?
Robin Morningwood Adventure - Gay Bara RPG (18+) may contain content you must be 18+ to view.
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I'm sorry but as written here: https://grizzly-gamer-studio.itch.io/robin-morningwood-adventure the android version is exclusive to the itch.io version (because Steam doesn't handle android games)