Games like Undead Souls
Games like Undead Souls include SYNTHETIK: Legion Rising, Nuclear Throne, Hotline Miami, RUINER, and Splatter - Zombiecalypse Now. We matched them by the tags players give Undead Souls on Steam (Action, Indie, Top-Down Shooter, Top-Down, and Twin Stick Shooter): closest matches first, and among equally close ones the better-known games.

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Indie · Action

Nuclear Throne
Shared: Indie · Action · Difficult

Hotline Miami
Shared: Action · Indie · Top-Down

RUINER
Shared: Action · Top-Down Shooter · Indie

Splatter - Zombiecalypse Now
Shared: Action · Top-Down Shooter · Indie

Enter the Gungeon
Shared: Indie · Difficult · Twin Stick Shooter

Hotline Miami 2: Wrong Number
Shared: Action · Top-Down · Difficult

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

Nation Red
Shared: Action · Indie · Top-Down Shooter

Cuphead
Shared: Difficult · Co-op · Indie

The Binding of Isaac
Shared: Indie · Action · Difficult

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

Hades
Shared: Indie · Action · Roguelite

SYNTHETIK 2
Shared: Top-Down Shooter · Twin Stick Shooter · Top-Down

Left 4 Dead 2
Shared: Action · Co-op · Zombies

Nex Machina
Shared: Action · Twin Stick Shooter · Indie

Resident Evil 3
Shared: Action · Horror · Zombies

Risk of Rain (2013)
Shared: Indie · Action · Difficult

Risk of Rain 2
Shared: Action · Co-op · Roguelite

The Ascent
Shared: Top-Down Shooter · Action · Indie

Killsquad
Shared: Action · Top-Down Shooter · Co-op

BALL x PIT
Shared: Action · Top-Down Shooter · Roguelite

Ravenswatch
Shared: Action · Co-op · Indie

Relic Hunters Zero: Remix
Shared: Action · Top-Down Shooter · Twin Stick Shooter