In ChipTone, should one repeatedly click “randomize” for unique sounds?

Foleying is better in the sense that it is more fun creatively.

https://en.wikipedia.org/wiki/Foley_(filmmaking)

Or conversely, you can hire a professional to work with.

Like these people: https://www.monstersp.com/custom-music

For disclosure, John (a partner and a big part of the game audio studio) and I have been friends since kindergarten in 1970. If you want a warm intro, send me an email.

Good luck.

Sound design, like illustration, like UI, like programming, is it's own discipline and artists and technicians and archives abound.

There's places like : https://freesound.org/

And there's freelancers too.

But, how "unique"? Do any of the sounds need to convey information?

It's a journey.