Cellular phones are basically pocket computers with more horsepower than desktops of yesteryear. They can run a surprising amount of great games - not just microtransaction fests, but actual solid games. And even some of the games that HAVE microtransactions, like Fallout Shelter, are great games without paying one slim dime.
I'm well aware that my mid-range phone has massively more power than the K6/3-400 & Voodoo3 PC I keep around for legacy games. I just didn't realise that there were people making premium mobile games because the microtransaction pay-to-win model is so prevalent.
The other game I tried on my phone was Repton 3 from Superior Interactive, which I'd played on my BBC model B back in the 1980s. It was a good quality update of the game and microtransaction-free, but I found trying to control it on a 5" touchscreen was too frustrating so I ended up getting my old hardware out of the attic instead :))
I think that for mobile gaming to work for me, I want something more like the Nintendo Switch, where I've got physical controllers rather than having to obstruct half the screen with my hand all the time. OTOH it looks like the switch is a bit big to carry in my pocket all day...