Games like Blast Horizon
Games like Blast Horizon include Sky Force Reloaded, BALL x PIT, Deep Rock Galactic: Survivor, Bit Blaster XL, and Planes, Bullets and Vodka. We matched them by the tags players give Blast Horizon on Steam (Bullet Hell, Shoot 'Em Up, Top-Down Shooter, Flight, and PvE): closest matches first, and among equally close ones the better-known games.

Sky Force Reloaded
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

BALL x PIT
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Top-Down Shooter · PvE

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

Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · Shooter

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

DoDonPachi Resurrection
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

Insect Swarm
Shared: Shoot 'Em Up · Top-Down Shooter · Shooter

WOWOWOW KORONE BOX
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

Chippy
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

Crimzon Clover World EXplosion
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

Greedland
Shared: Shoot 'Em Up · Bullet Hell · Top-Down Shooter

Waves
Shared: Bullet Hell · Shoot 'Em Up · Shooter

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

ACE COMBAT 8: WINGS OF THEVE
Shared: Flight · Shooter · Vehicular Combat

LUFTRAUSERS
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Bot Vice
Shared: Bullet Hell · Top-Down Shooter · Shoot 'Em Up

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Flight · Shooter · Arcade

Ikaruga
Shared: Bullet Hell · Shoot 'Em Up · Arcade

ESCHATOS
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

Revolution Ace
Shared: Shoot 'Em Up · Bullet Hell · Shooter

Furious Angels
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter

Raptor: Call of The Shadows - 2015 Edition
Shared: Bullet Hell · Shoot 'Em Up · Top-Down

SNKRX
Shared: Top-Down Shooter · Shoot 'Em Up · Arcade