Games like Augurium Mortis
Games like Augurium Mortis include Sektori, Insect Swarm, Chippy, Assault Android Cactus+, and SNKRX. We matched them by the tags players give Augurium Mortis on Steam (Arena Shooter, Shoot 'Em Up, Top-Down Shooter, Twin Stick Shooter, and Shooter): closest matches first, and among equally close ones the better-known games.

Sektori
Shared: Shoot 'Em Up · Twin Stick Shooter · Arena Shooter

Insect Swarm
Shared: Shoot 'Em Up · Shooter · Top-Down Shooter

Chippy
Shared: Arena Shooter · Shoot 'Em Up · Twin Stick Shooter

Assault Android Cactus+
Shared: Shoot 'Em Up · Twin Stick Shooter · Shooter

SNKRX
Shared: Arena Shooter · Top-Down Shooter · Shoot 'Em Up

Brigador: Up-Armored Edition
Shared: Twin Stick Shooter · Top-Down Shooter · Mechs

Sky Force Reloaded
Shared: Shoot 'Em Up · Top-Down Shooter · Arcade

Deployment
Shared: Arena Shooter · Top-Down Shooter · Shooter

Halo: Spartan Assault
Shared: Top-Down Shooter · Shooter · Twin Stick Shooter

Nova Drift
Shared: Shoot 'Em Up · Arena Shooter · Arcade

Kill The Crows
Shared: Top-Down Shooter · Arena Shooter · Arcade

Tesla vs Lovecraft
Shared: Arena Shooter · Top-Down Shooter · Shooter

State of Anarchy: Master of Mayhem
Shared: Top-Down Shooter · Shoot 'Em Up · Twin Stick Shooter

Nex Machina
Shared: Twin Stick Shooter · Shoot 'Em Up · Arcade

Titan Attacks!
Shared: Arena Shooter · Shoot 'Em Up · Top-Down Shooter

X Invader
Shared: Arena Shooter · Shoot 'Em Up · Twin Stick Shooter

Waves
Shared: Shoot 'Em Up · Twin Stick Shooter · Shooter

HELLDIVERS™ Dive Harder Edition
Shared: Top-Down Shooter · Twin Stick Shooter · Shooter

Livelock
Shared: Top-Down Shooter · Twin Stick Shooter · Shooter

Time Wasters
Shared: Arena Shooter · Twin Stick Shooter · Shoot 'Em Up

BALL x PIT
Shared: Arcade · Shoot 'Em Up · Top-Down Shooter

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Twin Stick Shooter · Shooter

Renegade Ops
Shared: Twin Stick Shooter · Arcade · Shoot 'Em Up

The Hong Kong Massacre
Shared: Top-Down Shooter · Twin Stick Shooter · Shooter