These pictures from Rcouret display the two free books Roblox sent to him. These books came out in November 2018, and mention Galaxy! (albeit with extremely outdated pictures for the time of the publication) Here are some of the images of the pages.
Roblox "Top Adventure Games" p.42, 43
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Roblox "Character Encyclopedia" p. 47
-1.png "Unknown (2)-1.png (643 KB)")
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