bro, your cards are top) By the way, hi from Russia)))

Kind of, but also no???
So originally, the spaceship sticking coming out of the skybox in gm_trippin was just me reusing part of an old map. In gm_subliminal, I had more section of the same map I wanted to reuse so I put it back in. The ship wasn't ever fully mapped out until gm_innernette, and by then I had come up with the idea of putting it in all my abstract/dreamcore maps as a sort of calling card. The actual "lore", if you can even call it that, is just that the ship is exploring these dimensions.

bro, do you have a story on your cards?(Just because all the Dreamcore cards have a spaceship)

Amazing username lol

Hey brother just wanted to say I enjoyed playing on your maps in the past. I had a lot of fun memories

So, the map itself was actually created as a commission for The Idle House, a long defunct TF2 server. It had went through a few iterations before coming to it's final state, but those really weren't much to write home about (just some slight layout changes and song changes in the disco iirc)
As for secrets, there's not many, but two I remember are shooting the cow skull in the garage will unlock a path to the skybox in the freezer of the pub, and shooting the cow skull in the condo will unlock a path to the roof.