I've grappled with that pain for a long time now. I don't have a perfect answer, but I'll throw out another reading recommendation: The Sunny Nihilist by Wendy Syfret. It's not specifically about death, but about finding (or defining) meaning in the face of meaninglessness.
I'll also say there's a difference between engaging philosophically with the idea of death, and having panic or anxiety attacks about it. When my existential thoughts turned into panic attacks I sought therapy, which gave me tools to ground myself and get out of the downward spiral of dread.
The value of the money made is relative to how much money the person has. A person going from $0 -> $5 gets more value than a person going from $1,000,000 -> $1,000,005.
This looks awesome! A buddy and I made a very similar turn based 'game' a while back, but never added accounts etc for public matches: https://ikottman.com/apps/slime-mind/
Yours looks much more polished, I'll give it a try!