Your game was listed as the first entry when I searched for it.
Viewing post in Game not showing and ghosted from support
While it might appear if you search the full title, it doesn't show up in the search suggestions as you type. If you search for broader terms like 'deep' or 'dungeon', the game is nowhere to be found. Most importantly, it's completely missing from the 'Card Games' category and the general filters. I believe this is because the game hasn't been indexed yet; as the FAQ mentions, this process can take a few business days after publishing
Search suggestions do not search the whole catalogue. It searches about the top most popular 1% of games or even less.
And you do not search terms. It is literal title search. Not term search. Yes, that's not intutive. I complained about this many times.
If it is not a cache issue (the index gets rebuilt a lot), any game that is findable by title search is also visible in it's tag listings and vice versa. Use more tags to have a shorter list. The card game list has 15000 entries.