Games like Synth Swinger
Games like Synth Swinger include Portal 2, Portal, Supraland, Viewfinder, and Atomic Heart. We matched them by the tags players give Synth Swinger on Steam (Puzzle Platformer, FPS, Singleplayer, Adventure, and 3D): closest matches first, and among equally close ones the better-known games.

Portal 2
Shared: Singleplayer · Puzzle Platformer · Puzzle

Portal
Shared: Puzzle Platformer · Puzzle · Singleplayer

Supraland
Shared: Puzzle Platformer · Adventure · Singleplayer

Viewfinder
Shared: Puzzle Platformer · Singleplayer · Puzzle

Atomic Heart
Shared: FPS · Adventure · Singleplayer

LIMBO
Shared: Puzzle Platformer · Puzzle · Adventure

VLADiK BRUTAL
Shared: FPS · Adventure · Puzzle

Mirror 2: Project X
Shared: 3D · Singleplayer · FPS

Grimhook
Shared: Adventure · FPS · Action-Adventure

Little Nightmares II
Shared: Singleplayer · Adventure · Puzzle

Chants of Sennaar
Shared: Singleplayer · Adventure · Puzzle

Little Nightmares
Shared: Puzzle Platformer · Singleplayer · Adventure

COCOON
Shared: Adventure · Puzzle Platformer · Puzzle

Half-Life 2
Shared: FPS · Singleplayer · Adventure

Trine 2: Complete Story
Shared: Puzzle Platformer · Action-Adventure · Puzzle

Sonic Frontiers
Shared: Adventure · Singleplayer · 3D

Seen
Shared: Singleplayer · Adventure · Puzzle

Indiana Jones and the Great Circle
Shared: Singleplayer · Action-Adventure · Adventure

High On Life
Shared: FPS · Singleplayer · Adventure

Trine 3: The Artifacts of Power
Shared: Puzzle Platformer · Action-Adventure · Puzzle

Moncage
Shared: Singleplayer · Puzzle · Adventure

Darwin's Paradox!
Shared: Adventure · Puzzle Platformer · Singleplayer

Supraland Six Inches Under
Shared: Puzzle Platformer · Adventure · FPS

Planet of Lana
Shared: Puzzle Platformer · Singleplayer · Puzzle