Halliday had preserved his childhood forever, here in the OASIS. (10.21)
Most of the OASIS seems to exist to preserve permanently Halliday's nostalgia. It's like a digital fountain of youth, a place that can take him back to his younger days, when life felt infinite.
The ability to save my place at any time basically gave me infinite lives. (10.39)
This might be one of the reasons video games unconsciously appeal to Wade. They give him the ability to defy death, to try things and again and again.
CONGRATULATIONS! YOU HAVE AN EXTRA LIFE! (36.10)
One of Wade's religions—video games—does something that religion cannot: it definitively promises reincarnation.