I don’t pay that much attention to mobile gaming because I’m primarily a PC wanker with a Switch but I know that there are good mobile versions of fairly hardcore penoid card games like Hearthstone and Eternal.
There’s also been a big push by board game publishers to get their stuff playable digitally and especially on mobile. I don’t personally like Ticket to Ride or Carcassonne but there are faithful mobile versions of them. I have mobile versions of Star Realms, Friday, Onirim and Through The Ages, all of which are penoid board games that I play or have played the cardboard versions of.
Plus there’s those free to play racing games like Asphalt (I think?) and the Mario Kart Tour thing, plus some other Nintendo things. And that’s before getting into console emulators or adaptations of older PC or console games.