I don't game much on my phone because it's headache-inducing without a controller and, if I'm using a controller, I might as well play on my PC or Switch.
Swordigo is one of the few mobile RPGs I did not rage quit from continuously clicking the wrong buttons. Granted, there are only two directions unlike the joystick style controls games nowadays need. It seems to be completely free now and I highly recommend.
Along the lines of sideloading: proper adblock
I was reminded ads exist after I bought an iPad for school (sadly the notetaking experience is truly unrivaled). Adblock only works on Safari and whether it'll work properly is another roll of the dice.