Definitely the second one.
I have books that I value because of what they mean to me - who I got them from, or when, etc.
Other people don't have that context for those copies, and don't have that reason to keep them - nor should they, really. To want someone else to keep them *all* is unrealistic.

I last played Outer Wilds five years ago, and it has never left my head and my heart in all that time.

"E(s)ther Jar! Come inside!"
('Ether Jar' is another, older term for an entomologist's en.wikipedia.org/wiki/Killing...)

My first two connections would be "Inedible" and "Indelible", though I'm wondering how to get to Halloween with them.
InedibleWeirdo (WARNING: DO NOT EAT)
IndelibleWeirdoBloodstains
I'm sure somebody can take those ideas and run with them!

Yep, "Shrike", named after the impaling bird!
en.wikipedia.org/wiki/Shrike

Adam withouttheshrIEk
And Halloween is a state of mind, not just a season! Be the spooky you want to see in the world! :D

It'd work visually, but not phonetically - "Siggne of the End Times"?

"Bookchop"? "Leslayer"? I think there's a seed of a good idea in there; I just can't quite polish it up as nicely as I'd like.

"Hush, my angel! HUUUUUUUSH!"

First thing that comes to mind for me is "Andy Carrion"; second thing that comes to mind is "AnDIE! DIE! DIE! Karlson" - hopefully that sparks an idea or two?

If you're looking for something friendlier, maybe something along the lines of 'Your Shoulder Devil-ine Warren'?

You could go with a classic, "Tomb"?

Intombed Buriedton? (BTW, love the mathematical icon! <3 )

Wazombie is amazing! That said, if you're looking for alternatives, "Was-a-bi, now-a-corpse"?
(Yeah, I know it's not pronounced that way, but sometimes you go phonetically, sometimes you go as-written. :D )

Jon Groan? Or Dunjeon Green? (My initial attempts at combining 'dungeon' with your first name, in a way that'd be pronounced correctly, looks hilariously terrible - 'DungJon' :D )

Djinngarden?
"Djinngarden wishes you a spoooooky Halloween!"

Kem Killy? The classic Spooky Spoonerism gambit!

(Just don't ask how long the Spooky Spoonerism gambit's been a classic!)