Guns of Boom
For a while, we had Deer Hunter 2018 on this list, but that's not really a "shooter game" like most shooter games. Yes, it's first person, but it's a different feel completely.
Instead, we've added Guns of Boom, one of the most popular FPS shooter games for both Android and iOS. Guns of Boom is almost like Team Fortress from the old days, where you're playing multiple characters in a fast-paced high-action arena.
The game has easy intuitive controls, tons of weapons and maps, and even a neat Augmented Reality mode you can change to while you're dead, and spectating other players. Another thing that's great about Guns of Boom is the graphics. They're good, but they're no so over the top that older phones struggle. You can even play on a tablet, just fine.