My two cents on this:
True level = original order, maybe a simpler time and space.
After he steps out of true level he says "lambs to the cosmic slaughter."
It's in the chaos (not-level) that we exist today and have for while as human species.
That's why Morty wanted to stay in the true level. It was pure, original.
Half truths everywhere in Rick and Morty.
That is the best we can expect from any MSM television show. Muh, you know who makes most MSM television shows.
From what I can guess little nuggets of Hermetic Wisdom, & Gnosticism.