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Hey. I have 2 questions before I buy the game.
(1) I will pay $ 5 and get access to all versions of the game (alpha, beta,
full release) is this true?
(2) Will my copy of the game (purchased at this time on this site) be available to me in Steam after the release?

(1) Yep.

(2) In short: yep. Once we release on Steam, people who got the game on itch will receive steam keys.