Games like Signal Decay
Games like Signal Decay include Streets of Rogue, Risk of Rain 2, Enter the Gungeon, Ravenswatch, and Gunfire Reborn. We matched them by the tags players give Signal Decay on Steam (Indie, Strategy, Action, Adventure, and Stealth): closest matches first, and among equally close ones the better-known games.

Streets of Rogue
Shared: Action Roguelike · Indie · Roguelite

Risk of Rain 2
Shared: Co-op · Action Roguelike · Action

Enter the Gungeon
Shared: Indie · Action Roguelike · Co-op

Ravenswatch
Shared: Co-op · Action · Action Roguelike

Gunfire Reborn
Shared: Indie · Roguelite · Co-op

Skul: The Hero Slayer
Shared: Indie · Action · Action Roguelike

Wizard of Legend
Shared: Action Roguelike · Action · Adventure

Hades
Shared: Indie · Action Roguelike · Action

One Step From Eden
Shared: Action Roguelike · Action · Roguelite

Monaco: What's Yours Is Mine
Shared: Indie · Co-op · Strategy

Satellite Reign
Shared: Strategy · Action · Indie

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Stealth · Indie

SYNTHETIK: Legion Rising
Shared: Indie · Action · Roguelite

PUBG: BATTLEGROUNDS
Shared: Action · Co-op · Strategy

Heat Signature
Shared: Indie · Stealth · Action

Teenage Mutant Ninja Turtles: Splintered Fate
Shared: Co-op · Adventure · Action

Risk of Rain (2013)
Shared: Indie · Action · Action Roguelike

Slay the Spire 2
Shared: Strategy · Co-op · Indie

The Binding of Isaac: Rebirth
Shared: Indie · Action Roguelike · Difficult

Nuclear Throne
Shared: Indie · Action Roguelike · Action

Hero Siege
Shared: Action Roguelike · Co-op · Indie

Heroes of Hammerwatch
Shared: Co-op · Action Roguelike · Roguelite

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

Aragami
Shared: Action · Indie · Stealth