Immortal ain't bad man...
I've played a good deal of mobile games, and this is the first ARPG that even approaches anything that a proper PC or console experience offers.
Elder Scrolls Blades for instance is a single hub (town) that starts off demolished but then you can upgrade with about 3 beneficial plots (blacksmith, alchemist, enchanter).
The rest you can rebuild with homes/buildings that cost in-game gold but do absolutely nothing for the player except level up your town's experience points.
All dungeons/zones are limited to about 5 tile sets that look identical to one another, and so do most of the mobs.
The NPC arena events are over in about 5 seconds, and the PVP from what I remember, is over in about 5 seconds too and they pair you up with other players 50 levels out of your range.
IMO, the best games on mobile platforms are escape games or point and click adventure games, like the Forgotten Hill series and Life Gallery.
Some PC ports are excellent on mobile too, such as The Banner Saga (1 & 2... 3 isn't available for mobile).
Older games such as Sanitarium, and the Infinity Engine games are available for mobile, but they're semi unplayable due to everything being microscopic including the UI (the Infinity Engine games are recommended for no screen size smaller than a tablet).