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What if i have the game bought and get a new computer, will i have to buy it again becuase im getting a new computer soon

Nope, if you're logged into itch.io with the same account you bought the game with, then on the MoonBase store page you should see a "You own this game" message at the top along with a "Download" button.

Or you can use the download link that was included in the itch.io confirmation email you got when you purchased the game.