Games like Interstellar Plunderer
Games like Interstellar Plunderer include Vampire Survivors, Megabonk, Nova Drift, BALL x PIT, and Crab Champions. We matched them by the tags players give Interstellar Plunderer on Steam (Action Roguelike, Roguelite, Arcade, Shoot 'Em Up, and On-Rails Shooter): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Roguelite · Bullet Hell

Megabonk
Shared: Action Roguelike · Roguelite · Bullet Hell

Nova Drift
Shared: Roguelite · Shoot 'Em Up · Action Roguelike

BALL x PIT
Shared: Roguelite · Arcade · Action Roguelike

Crab Champions
Shared: Action Roguelike · Arcade · Third-Person Shooter

Risk of Rain 2
Shared: Action Roguelike · Roguelite · Third-Person Shooter

20 Minutes Till Dawn
Shared: Action Roguelike · Roguelite · Bullet Hell

Halls of Torment
Shared: Action Roguelike · Roguelite · Bullet Hell

Rogue: Genesia
Shared: Action Roguelike · Roguelite · Arcade

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Roguelite · Bullet Hell

SNKRX
Shared: Action Roguelike · Roguelite · Shoot 'Em Up

Star of Providence
Shared: Roguelite · Action Roguelike · Shoot 'Em Up

Soulstone Survivors
Shared: Action Roguelike · Roguelite · Bullet Hell

Death Must Die
Shared: Action Roguelike · Roguelite · Bullet Hell

Boneraiser Minions
Shared: Action Roguelike · Roguelite · Bullet Hell

Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Arcade

Goobies
Shared: Action Roguelike · Roguelite · Bullet Hell

Whisker Squadron: Survivor
Shared: Action Roguelike · On-Rails Shooter · Shoot 'Em Up

Utopia Must Fall
Shared: Arcade · Roguelite · Action Roguelike

Yet Another Zombie Survivors
Shared: Action Roguelike · Roguelite · Arcade

Slime 3K: Rise Against Despot
Shared: Action Roguelike · Roguelite · Bullet Hell

Time Wasters
Shared: Action Roguelike · Roguelite · Bullet Hell

Zombieville USA 3D
Shared: Arcade · Action Roguelike · Roguelite

LORT
Shared: Action Roguelike · Roguelite · Third-Person Shooter