Games like Eternal Rain
Games like Eternal Rain include Vampire Survivors, Halls of Torment, Skul: The Hero Slayer, Death Must Die, and ShellShock Live. We matched them by the tags players give Eternal Rain on Steam (Action, Strategy, Action Roguelike, Shooter, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Pixel Graphics · 2D

Halls of Torment
Shared: Action Roguelike · Action · Pixel Graphics

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Pixel Graphics

Death Must Die
Shared: Action Roguelike · Action · Pixel Graphics

ShellShock Live
Shared: Strategy · Action · 2D

BALL x PIT
Shared: Action · Action Roguelike · Pixel Graphics

Enter the Gungeon
Shared: Action Roguelike · Pixel Graphics · Action

Rocket Rats
Shared: Action Roguelike · Pixel Graphics · Action

Nuclear Throne
Shared: Action Roguelike · Action · Pixel Graphics

UnderMine
Shared: Action Roguelike · Action · Pixel Graphics

The Binding of Isaac: Rebirth
Shared: Action Roguelike · Pixel Graphics · 2D

The Escapists
Shared: Strategy · Pixel Graphics · Action

Dead Cells
Shared: Action Roguelike · 2D · Pixel Graphics

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

Broforce
Shared: Action · Pixel Graphics · 2D

Counter-Strike 2
Shared: Shooter · Action · Strategy

Kingdom Rush - Tower Defense
Shared: Strategy · 2D · Action

Sephiria
Shared: Action Roguelike · Action · Pixel Graphics

The Binding of Isaac
Shared: Action Roguelike · Action · Dark

Hero Siege
Shared: Action Roguelike · Pixel Graphics · Action

Star of Providence
Shared: Action Roguelike · Action · Pixel Graphics

Dungreed
Shared: Action Roguelike · Action · Pixel Graphics

Angel at Dusk
Shared: Action · Shooter · 2D

Boneraiser Minions
Shared: Action Roguelike · Pixel Graphics · 2D