Games like Moonlit Carnage
Games like Moonlit Carnage include Black Myth: Wukong, Goobies, The Ascent, Yet Another Zombie Survivors, and ATLYSS. We matched them by the tags players give Moonlit Carnage on Steam (Action, Casual, Action RPG, Shooter, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Black Myth: Wukong
Shared: Action · Action RPG · RPG

Goobies
Shared: Bullet Hell · Casual · Top-Down Shooter

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

Yet Another Zombie Survivors
Shared: Zombies · Top-Down Shooter · Action RPG

ATLYSS
Shared: Action RPG · Action · 3D

FatalZone
Shared: Bullet Hell · Action · Zombies

Apocalypse Party
Shared: Casual · Bullet Hell · Top-Down Shooter

Army of Ruin
Shared: Bullet Hell · Top-Down Shooter · Shooter

The Killing Antidote
Shared: Action · Shooter · Zombies

Zombieville USA 3D
Shared: Action · Shooter · Top-Down Shooter

Noobs Want to Live
Shared: Action · Bullet Hell · Casual

Left 4 Dead 2
Shared: Action · Zombies · Shooter

Gem Defender: Soyjak Survivors
Shared: Action · Shooter · Bullet Hell

Planes, Bullets and Vodka
Shared: Action · Casual · Bullet Hell

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

Borderlands 2
Shared: Action · Shooter · RPG

Warframe
Shared: Action RPG · Action · RPG

Vampire Survivors
Shared: Bullet Hell · Casual · Action

Dead Bits
Shared: Action · Casual · Shooter

DUNGEON RAZE
Shared: Action RPG · Casual · Action

Bit Blaster XL
Shared: Bullet Hell · Shooter · Action

Just Act Natural
Shared: Casual · Action · Shooter

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

Halls of Torment
Shared: Bullet Hell · Action · Action RPG