Games like ZombieMaze
Games like ZombieMaze include Escape From Duckov, The Final Station, Left 4 Dead 2, Broforce, and BALL x PIT. We matched them by the tags players give ZombieMaze on Steam (Action, Shooter, Hero Shooter, Shoot 'Em Up, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

Escape From Duckov
Shared: Action · Shooter · Top-Down Shooter

The Final Station
Shared: Pixel Graphics · Action · 2D

Left 4 Dead 2
Shared: Shooter · Action · Horror

Broforce
Shared: Action · Pixel Graphics · 2D

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

The Last Stand: Aftermath
Shared: Shooter · Top-Down Shooter · Action

Hotline Miami
Shared: Action · Pixel Graphics · Top-Down

20 Minutes Till Dawn
Shared: Shoot 'Em Up · Top-Down Shooter · Pixel Graphics

ZERO Sievert
Shared: Shooter · Pixel Graphics · Action

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

12 is Better Than 6
Shared: Action · Shooter · Top-Down Shooter

Angel at Dusk
Shared: Action · Shooter · 2D

Call of Duty®: Black Ops III
Shared: Shooter · Action · Hero Shooter

Zombotron
Shared: Action · 2D · Shooter

Terraria
Shared: 2D · Pixel Graphics · Adventure

METRO Last Light Redux
Shared: Action · Shooter · Post-apocalyptic

Nuclear Throne
Shared: Action · Pixel Graphics · Top-Down Shooter

Five Nights at Freddy's: Into the Pit
Shared: Pixel Graphics · 2D · Action

Cyberhunt
Shared: Action · Shoot 'Em Up · 2D

Paladins®
Shared: Hero Shooter · Shooter · Action

DayZ
Shared: Shooter · Action · Post-apocalyptic

Apex Legends™
Shared: Shooter · Action · Hero Shooter

Huntdown
Shared: Shooter · Action · Pixel Graphics

METRO 2033 Redux
Shared: Action · Shooter · Post-apocalyptic