In Agar.io you can be pretty confident the mega bubble doesn't really care to gobble you up, so long as you stay beneath a certain size.
This guarantee breaks down if the mega bubble gets bored and eats you out of spite, or you become large enough to look tasty to it, or you accidentally hang out with enough other bubbles your size to appear as a tasty net meal.
Agar.io is possibly the greatest market metaphor humanity has ever created and I feel like I'm one of the few who realizes it.
I prefer chopcoin.io (you can win/bet BTC), but agree on the profundity of the game.
It's not just distilling the essence of financial markets, as agar-type games recapitulate the ontogeny of biology and the evolutionary trade-offs involved.
The
Hermetic principles are on full display in that brilliant cross between Conway's Game of Life, Go, poker, and [favorite first person shooter].
"That which is Below corresponds to that which is Above, and that which is Above corresponds to that which is Below, to accomplish the miracle of the One Thing."
The basic dopaminergic mesolimbic joy of grazing on energy pellets, the existential terror of being eaten, the pressure to adapt/react/strategize all at once, the wonders of the Kybalion illustrated...
"Wow this is fun...I am a happy little bubble...nom...nom...nom...bloop...bloop...bloop"

"Oh man that was close!...Haha, got you chump!"

"ZOMG that fat fuck just swallowed me whole!...I hate this stupid game!"

"How much longer until the next round begins?"

Chopcoin is a great model for faucets as a fun, addictive means to gain Proof Of Humanity.
I'd love to license the code for XMR and use it to distribute tacoshis. Maybe I'll put up a FFS thread after the GUI is done.