I was in the same situation as you, even worse, my switch is hooked up to our TV, charged and ready to go, but still haven’t gotten much use.
If it weren’t for my wife getting it for me I probably would’ve skipped the Steam Deck and I wouldn’t have been able to game as much as I had since getting it.
I’ve had it since November last year and I’ve finished KH1, KH Re:CoM, KH2, DMC V, and am currently playing Nier Automata. It’s such a fun little device that allows me to squeeze in some gaming between work, taking care of a newborn, and other chores.
If you have a steam backlog you’ve been itching to play, I’d say definitely go for it. Otherwise, if you find yourself wishing you squeezed in a 5 to 10 minute gaming session during idle times, I’d say that’s a good indicator a Steam Deck would be a good purchase for you.
Oh yeah. This is quite fun, though once you hit level 4/5 some problems require fairly advanced algorithms / mathematics. One of the problems I gave up on solving on my own required knowledge of Polyas enumeration theorem to solve. Fortunately or unfortunately you can find some answers online, otherwise I would’ve never even known such a theorem existed.
For the tougher problems, expect a lot of graph theory / combinatorics, which I guess is the nature of Googles challenges as a search engine.