Worlds Without Number is pretty perfect for this. It's a Dying Earth-style game that has enough dials to create the exact feel you're looking for.
It is? Dying Earth like Pelgrane Dying Earth, or Dying Earth like Dungeon Crawl Classics, or some other thing that's eluding me (Numenera, maybe)? From what I thought I knew of WWN I didn't think any of those were very close. Maybe i need to go listen to some reviews or APs of it.
I’m only passingly aware of those works. What I know of it would fill a thimble.
If you like medium-soft scifi (it's got a lot of psionics in the mix, which were more in fashion when they were written) I heartily recommend everything James Schmitz wrote - although the one book you tend to see recommended as his best (Witches of Karres) would be toward the end of my personal rec list, didn't find that one as engaging as most folks seem to, and I borderline hated the modern sequel Wizard of Karres that Lackey and Flint wrote. He's really something of an overlooked gem, and deserves another reprint cycle IMO.
The guy got an alien into Wayne Barlowe's Guide Guide To Extraterrestrials (another thing that do with a reprint - or sequel) back in the day, that's got to count for something, right?

Mind you, the Old Galactics are probably the least visually interesting species in the whole body of Schmitz's work, but I guess even Wayne phoned it in sometimes. He probably needed a break from drawing that Velantian.
You do remind me that Alternity might be a decent fit for the job. It's pretty generic scifi and the tech and psi assumptions are reasonably close.
All flesh must be eaten is awesome game, but i feel it's largely forgotten and IMHO really underappreciated.
On an irrelevant side note, George Vasilakos owns the major FLGS. Haven't been in in a few months, but the last time I saw him he was recovering well from the stroke he had a while back. I should really get over there soon and see how things are going.