Credits:

Author: Jockum Skoglund (hipshot)
The cloudy skybox
https://opengameart.org/content/stormy-days-skybox

Author: vladislavzh
The retro ocean skybox
https://opengameart.org/content/retro-skyboxes-pack

Author: Ulukai
Eclipse and Nebula skybox
https://opengameart.org/content/ulukais-space-skyboxes

Author: slimeslabs
Ps1 Sky
https://modrinth.com/user/slimeslabss