I have a couple thousand hours of play on Slay the Spire on my iPad. It’s such a perfect game for mobile. I play it on the plane, at night on work trips, been playing it again on vacation this week. Just a fantastic grab-it-and-go gaming experience.
Years ago I put in hundreds of hours in Call of Duty Mobile and got really good at it. I even joined clans and eventually started my own clan.
I really liked it honestly, but I tried it recently and I seriously have no idea how I was so accurate at one point. Honestly it's not as uncomfortable as it seems once you find a good hand position, but there is definitely a high learning curve