I beat the game two times: Boat Ending & Blimp Ending.
I finished filling up the entire sea with Ground to it's numerical limit.
I made a house in the Top-Left Corner with all my utilities.
I have finished the game.
Sincerely,
MEPt
Ok only the third video, great removed features not under copyright:
World Settings
World Type
World Shape And Size
World Themes
Further reading:
https://minecraft.fandom.com/wiki/Java_Edition_Indev
https://minecraft.fandom.com/wiki/Indev_map_settings
Also I am sorry that I compared Cosmic Reach that much to Minecraft. I know it must get tiring to see that many comments messing that up.