Not yet sure, but most likely the developer of the game will consider uploading it on Steam to gain more popularity.
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I do hope that the developer would have the game on steam. As a way to support the developer by buying it over there rather than doing monthly on patreon. That and also I'm the kind of person who perfer to have all games on steam rather than separate launchers. Though I do wonder if the game does release on steam, would it be the same version as the patreon version or would it be the same as the free version here on itch.