Games like orbital defence unit
Games like orbital defence unit include Vampire Survivors, One Finger Death Punch, Skul: The Hero Slayer, Timberman, and MARVEL Tōkon: Fighting Souls. We matched them by the tags players give orbital defence unit on Steam (Action, Casual, 2D Fighter, Action Roguelike, and Arcade): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · 2D · Casual

One Finger Death Punch
Shared: Action · 2D Fighter · Casual

Skul: The Hero Slayer
Shared: Action · Action Roguelike · 2D

Timberman
Shared: Casual · Action · 2D

MARVEL Tōkon: Fighting Souls
Shared: Action · Casual · 2D Fighter

BlazBlue Entropy Effect
Shared: Action · Action Roguelike · 2D

Megabonk
Shared: Action Roguelike · Action · Indie

Windowkill
Shared: Action · Action Roguelike · Arcade

Iron Snout
Shared: Action · 2D Fighter · 2D

BALL x PIT
Shared: Action · Arcade · Action Roguelike

One Finger Death Punch 2
Shared: Action · Casual · 2D

Downwell
Shared: Action Roguelike · Action · Arcade

Little Fighter 2 Remastered
Shared: Action · 2D Fighter · Arcade

Boneraiser Minions
Shared: Action Roguelike · 2D · Casual

Rogue Legacy
Shared: Action · Action Roguelike · 2D

Planes, Bullets and Vodka
Shared: Action · Casual · Arcade

Stick Fight: The Game
Shared: Action · 2D Fighter · Casual

Cyberhunt
Shared: Action · Casual · Arcade

Bit Blaster XL
Shared: Action · Arcade · Casual

Your Only Move Is HUSTLE
Shared: Action · 2D Fighter · 2D

Rocket Rats
Shared: Action Roguelike · Casual · Action

Broforce
Shared: Action · 2D · Indie

WAVESHAPER
Shared: Action · Casual · Minimalist

Desktop Survivors 98
Shared: Action · Action Roguelike · Casual