Depends what you think of as 'casual', I guess. I have very limited gaming time, but when I do play I like to play very hard games - I just find it difficult to reconcile those sort of games with being 'casual', even though I guess my lack of time and dedication to gaming might make me a 'casual gamer'.
So what games can easily be dipped in/out of without a learning curve steep enough to put you off for life?
OP doesn't mean it in the traditional sense. More games that you can dip in and out of without completely losing track of what's going on or losing all track of the controls (so I'd guess no huge metroidvania's like Hollow Knight or complex RPG's) -
This.
Doesn't have to be chilled out or no action, but more something that doesn't have a macro for every key on the board that has to be become second nature or get insta gibbed. Basically anything that doesn't require that you live on it 8 hours a day just so you can enjoy it.
Shadow Tactics: Blades of the Shogun
Got this free recently, is it good?
I'll consider anything, although I tend not to go in for all this wizards, orks and fairy tale bull****.