Games like FLAG-O-TRON
Games like FLAG-O-TRON include Balatro, Slay the Spire, Slay the Spire 2, Game Dev Tycoon, and FTL: Faster Than Light. We matched them by the tags players give FLAG-O-TRON on Steam (Strategy, Indie, Casual, Card Game, and Roguelike): closest matches first, and among equally close ones the better-known games.

Balatro
Shared: Card Game · Roguelike · Strategy

Slay the Spire
Shared: Card Game · Strategy · Roguelike

Slay the Spire 2
Shared: Card Game · Strategy · Roguelike

Game Dev Tycoon
Shared: Indie · Strategy · Casual

FTL: Faster Than Light
Shared: Strategy · Roguelike · Indie

RACCOIN: Coin Pusher Roguelike
Shared: Strategy · Roguelike · Casual

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

Across the Obelisk
Shared: Casual · Card Game · Turn-Based Strategy

9 Kings
Shared: Strategy · Card Game · Roguelike

Dungeons & Degenerate Gamblers
Shared: Strategy · Roguelike · Card Game

Library Of Ruina
Shared: Strategy · Card Game · Difficult

Die in the Dungeon
Shared: Strategy · Roguelike · Card Game

Plague Inc: Evolved
Shared: Strategy · Indie · Casual

Monster Train 2
Shared: Card Game · Strategy · Roguelike

Wildfrost
Shared: Card Game · Difficult · Roguelike

The Binding of Isaac
Shared: Indie · Roguelike · Difficult

Ballionaire
Shared: Casual · Strategy · Roguelike

Breachway
Shared: Strategy · Card Game · Roguelike

Ratropolis
Shared: Strategy · 2D · Card Game

Backpack Hero
Shared: Strategy · Roguelike · Replay Value

Black Jacket
Shared: Card Game · Roguelike · Indie

Roguebook
Shared: Indie · Card Game · Strategy

Dicevaders
Shared: Strategy · Casual · Roguelike

Shogun Showdown
Shared: Roguelike · Strategy · Turn-Based Strategy