Games like Lunar Ascendant
Games like Lunar Ascendant include Suzerain, The Life and Suffering of Sir Brante — Chapter 1&2, Slay the Princess — The Pristine Cut, Democracy 4, and The Life and Suffering of Sir Brante. We matched them by the tags players give Lunar Ascendant on Steam (Choose Your Own Adventure, Political Sim, Visual Novel, Immersive Sim, and Interactive Fiction): closest matches first, and among equally close ones the better-known games.

Suzerain
Shared: Choose Your Own Adventure · Visual Novel · Political Sim

The Life and Suffering of Sir Brante — Chapter 1&2
Shared: Choose Your Own Adventure · Visual Novel · Interactive Fiction

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

Democracy 4
Shared: Political Sim · Economy · Management

The Life and Suffering of Sir Brante
Shared: Choose Your Own Adventure · Interactive Fiction · Visual Novel

Victoria 3
Shared: Political Sim · Economy · Diplomacy

Politics The Game
Shared: Political Sim · Interactive Fiction · Diplomacy

No Case Should Remain Unsolved
Shared: Visual Novel · Interactive Fiction · Point & Click

Tropico 6
Shared: Political Sim · Economy · Management

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

Five Hearts Under One Roof season2
Shared: Choose Your Own Adventure · Immersive Sim · Visual Novel

Long Live The Queen
Shared: Political Sim · Visual Novel · Choose Your Own Adventure

60 Seconds! Reatomized
Shared: Choose Your Own Adventure · Immersive Sim · Point & Click

Sovereign Tower
Shared: Choose Your Own Adventure · Visual Novel · Management

Breakout 13
Shared: Choose Your Own Adventure · Interactive Fiction · Immersive Sim

The Test: Final Revelation
Shared: Choose Your Own Adventure · Visual Novel · Immersive Sim

Whispers from the Star
Shared: Interactive Fiction · Visual Novel · Choose Your Own Adventure

60 Seconds!
Shared: Choose Your Own Adventure · Immersive Sim · Point & Click

Do Not Feed the Monkeys
Shared: Political Sim · Point & Click · Management

I Wani Hug that Gator!
Shared: Visual Novel · Choose Your Own Adventure · Interactive Fiction

For the People
Shared: Choose Your Own Adventure · Political Sim · Visual Novel

The Test
Shared: Choose Your Own Adventure · Visual Novel · Simulation

School Days
Shared: Choose Your Own Adventure · Immersive Sim · Visual Novel

Beholder 3
Shared: Political Sim · Choose Your Own Adventure · Point & Click