Games like PSIONIC
Games like PSIONIC include Terraria, The Forest, Rain World, Devil Daggers, and S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition. We matched them by the tags players give PSIONIC on Steam (Exploration, FPS, Bullet Hell, Difficult, and Survival): closest matches first, and among equally close ones the better-known games.
Terraria
Shared: Survival · Sandbox · Exploration
The Forest
Shared: Survival · Horror · Exploration
Rain World
Shared: Exploration · Difficult · Survival
Devil Daggers
Shared: FPS · Difficult · Horror
S.T.A.L.K.E.R. 2: Heart of Chornobyl - Standard Edition
Shared: FPS · Survival · Exploration
Ready or Not
Shared: FPS · Realistic · Horror
Metro Exodus
Shared: FPS · Survival · Horror
PUBG: BATTLEGROUNDS
Shared: Survival · FPS · Shooter
Starbound
Shared: Survival · Sandbox · Exploration
Subnautica
Shared: Survival · Exploration · Horror
Left 4 Dead 2
Shared: FPS · Survival · Horror
Don't Starve
Shared: Survival · Sandbox · Exploration
Core Keeper
Shared: Exploration · Survival · Pixel Graphics
Fallout 4
Shared: Exploration · FPS · Singleplayer
The Long Dark
Shared: Exploration · Survival · Sandbox
Far Cry® 2
Shared: FPS · Action · Exploration
Kerbal Space Program 2
Shared: Exploration · Sandbox · Difficult
Enter the Gungeon
Shared: Bullet Hell · Difficult · Pixel Graphics
20 Minutes Till Dawn
Shared: Bullet Hell · Survival · Horror
Subnautica: Below Zero
Shared: Survival · Exploration · Horror
Forager
Shared: Survival · Pixel Graphics · Sandbox
7 Days to Die
Shared: Survival · Exploration · FPS
METRO Last Light Redux
Shared: FPS · Horror · Survival
Sons Of The Forest
Shared: Survival · Exploration · Horror