Games like Spy Alliance
Games like Spy Alliance include Breakout 13, Mandate Of Heaven, Her Story, Hua Manlou, and Who's Lila?. We matched them by the tags players give Spy Alliance on Steam (Exploration, CRPG, Choose Your Own Adventure, Immersive Sim, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Breakout 13
Shared: Exploration · Choose Your Own Adventure · Interactive Fiction

Mandate Of Heaven
Shared: Visual Novel · Immersive Sim · Exploration

Her Story
Shared: Choose Your Own Adventure · Interactive Fiction · Exploration

Hua Manlou
Shared: Interactive Fiction · CRPG · Immersive Sim

Who's Lila?
Shared: Choose Your Own Adventure · Exploration · Interactive Fiction

60 Seconds!
Shared: Exploration · Choose Your Own Adventure · Immersive Sim

School Days
Shared: Exploration · Choose Your Own Adventure · Immersive Sim

60 Seconds! Reatomized
Shared: Choose Your Own Adventure · Exploration · Immersive Sim

No Case Should Remain Unsolved
Shared: Interactive Fiction · Puzzle · Visual Novel

Love Is All Around
Shared: Visual Novel · Interactive Fiction · FMV

Suzerain
Shared: Choose Your Own Adventure · Visual Novel · Interactive Fiction

Love is All Around: Echoes of Yesterday
Shared: Interactive Fiction · Visual Novel · Immersive Sim

Five Hearts Under One Roof season2
Shared: Choose Your Own Adventure · Immersive Sim · Interactive Fiction

Shao Song I
Shared: Interactive Fiction · Visual Novel · Immersive Sim

Disco Elysium - The Final Cut
Shared: CRPG · RPG · Point & Click

Love is All Around 2
Shared: Interactive Fiction · Visual Novel · Immersive Sim

Road to Empress I
Shared: Immersive Sim · Visual Novel · RPG

Slay the Princess — The Pristine Cut
Shared: Visual Novel · Choose Your Own Adventure · Interactive Fiction

Charming Hearts
Shared: Choose Your Own Adventure · Immersive Sim · CRPG

The Joker's Game
Shared: Choose Your Own Adventure · Immersive Sim · Interactive Fiction

Big Walk
Shared: Exploration · Puzzle · Immersive Sim

Tangle Tower
Shared: Exploration · Puzzle · Point & Click

美女,请别影响我成仙
Shared: Interactive Fiction · Visual Novel · FMV

ATOM RPG: Post-apocalyptic indie game
Shared: Exploration · CRPG · Puzzle