Games like The Blue Flamingo
Games like The Blue Flamingo include Vampire Survivors, LUFTRAUSERS, Planes, Bullets and Vodka, Bit Blaster XL, and BALL x PIT. We matched them by the tags players give The Blue Flamingo on Steam (Action, Indie, Shoot 'Em Up, Singleplayer, and 2D): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Indie · Bullet Hell · 2D

LUFTRAUSERS
Shared: Indie · Action · Arcade

Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Arcade

Bit Blaster XL
Shared: Shoot 'Em Up · Action · Bullet Hell

BALL x PIT
Shared: Action · Arcade · Shoot 'Em Up

Sky Force Reloaded
Shared: Shoot 'Em Up · Arcade · Action

Cyberhunt
Shared: Action · Indie · Shoot 'Em Up

Project Wingman
Shared: Action · Indie · Singleplayer

Star Saviors
Shared: Action · Shoot 'Em Up · Indie

ZeroRanger
Shared: Indie · Shoot 'Em Up · Action

A Dance of Fire and Ice
Shared: Indie · Singleplayer · 2D

Exit the Gungeon
Shared: Indie · Action · Arcade

Nova Drift
Shared: Shoot 'Em Up · Arcade · Bullet Hell

12 is Better Than 6
Shared: Action · Indie · Singleplayer

Revolution Ace
Shared: Action · Shoot 'Em Up · Indie

Jet Lancer
Shared: Action · Indie · Shoot 'Em Up

DRAINUS
Shared: Action · Indie · Shoot 'Em Up

Ikaruga
Shared: Shoot 'Em Up · Action · Arcade

Megabonk
Shared: Indie · Action · Bullet Hell

Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Action · Bullet Hell

Touhou Kouryudou ~ Unconnected Marketeers.
Shared: Action · Shoot 'Em Up · Bullet Hell

Touhou Tenkuushou ~ Hidden Star in Four Seasons.
Shared: Shoot 'Em Up · Indie · Bullet Hell

Hollow Knight: Silksong
Shared: Indie · 2D · Singleplayer

20 Minutes Till Dawn
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter