Existential, metaphysical, nihilist...take your pick. Hard to follow Michael Venn's "trip" through a war on Mars then Titan. He and others are evidently "infected" with a green prefer on Mars that allows them to communicate with Bugs a now extinct race that, according to Bear, seeded Mars and Earth.
Much of these two books are Venn's trying to describe. . . stuff.
If you're into psychedelia, War Dogs and its companion books are the right place to be. I like my stories concrete and easy to visualize, so these two books were a struggle.