Diablo Immortal's main gameplay is, essentially, the same as what you'd find in the first three Diablo 4 Gold games. Because Diablo is a mobile game initially, actions aren't as precise as well as character development seems slightly less detailed as well as a general impression that the game provides lots of options to adjust for the touch controls. It's not a problem however, since the difficulty will increase over time.
In typical Diablo fashion You'll also find loot along the way -- lots of it. Just about every enemy you take on will drop some kind item of magic or weapon and you'll always be shifting gear to become stronger as you go. Anything you don't want it is possible to salvage, which is among Diablo Immortal's best features. Rather than just disposing of useless equipment or scrapping it, you can use it into parts and use them to empower the gear you want to keep. This gives you a steady sense of growth, and also lets you develop long-term character strategies around strong items of equipment.
There's not much to complain about the instant-to-moment gameplay of Diablo Immortal. It's rewarding; there's plenty of diversity in the classes of characters ability, potential builds and abilities and there's plenty of intriguing things to collect. Structurally, though, the game does have some flaws.
Diablo Immortal doesn't cost anything to play. However, after the first few minutes, I was wish it had. I would've preferred to have paid a single, flat cost to play in my own way rather than being continuously bombarded with (surprisingly expensive) microtransactions in every single turn. Diablo IV Gold Immortal is by no way as good as free-to-play games, but each single F2P technique hinders the game rather than enhance it.