Is there an example game or session of this anywhere? The description of the game is rather vague. I can't find a YouTube video about it either.

There's a brief example of play at the end of the PDF. You're not likely to find a Youtube video or anything like that. Aside from "This Town Is Full Of Monsters," which does seem to have a very small following and occasionally gets played on some very indie actual play podcasts and such, most of my games are quite obscure. No marketing budget. Well ... no budget at all, really.

Anyway, I'll go ahead and put a screenshot of the in-book example on the game page so that you and other folks can check that out. Thanks for the question. Again, I don't really know much about marketing or storefront presentation, so these kinds of things sometimes slip through the cracks once I've finished a project and am eager to move on to the next one.

As a quick primer, Passage is intended as a fairly loose, poetic journaling experience, almost like reading an oracle deck, so you're not going to find heavy dungeon crawl rules, monsters, combat, or anything along those lines (I have been wanting to do something like that for a while, but it'd be a lot of work and there's already a ton on my plate right now).

The basic "gameplay" consists of rolling a d20 three times to generate a "prompt" composed of three symbolic Domains / Elements (a Domain is assigned to each face of the die, so you're basically always rolling on one relatively abstract universal table), coming up with a brief interpretation / scene based on the Domains you roll and any previously established narrative context, then choosing an action for your "character" to take in response to the prompt. The next time you roll, the previous set of conditions, and your chosen action, will usually directly inform and influence the next interpretation of the Domains that come up.

Again, I'll put a screenshot of the example page hopefully a few minutes after I hit 'post' on this, so you'll be able to check that out there.