Games like USG
Games like USG include BALL x PIT, Vampire Survivors, Sky Force Reloaded, Nova Drift, and Planes, Bullets and Vodka. We matched them by the tags players give USG on Steam (Shoot 'Em Up, Action, Bullet Hell, Top-Down, and Roguelike): closest matches first, and among equally close ones the better-known games.
BALL x PIT
Shared: Action · Bullet Hell · Shoot 'Em Up
Vampire Survivors
Shared: Bullet Hell · 2D · Roguelike
Sky Force Reloaded
Shared: Shoot 'Em Up · Bullet Hell · Action
Nova Drift
Shared: Shoot 'Em Up · Bullet Hell · Roguelike
Planes, Bullets and Vodka
Shared: Action · Shoot 'Em Up · Bullet Hell
Enter the Gungeon
Shared: Bullet Hell · Roguelike · Action
Nuclear Throne
Shared: Roguelike · Bullet Hell · Action
Star of Providence
Shared: Bullet Hell · Shoot 'Em Up · Action
Bit Blaster XL
Shared: Shoot 'Em Up · Bullet Hell · Action
Revolution Ace
Shared: Shoot 'Em Up · Action · Bullet Hell
Angel at Dusk
Shared: Action · Bullet Hell · Top-Down
Greedland
Shared: Shoot 'Em Up · Bullet Hell · Roguelike
LUFTRAUSERS
Shared: Bullet Hell · Action · Shoot 'Em Up
I Am Legion: Stand Survivors
Shared: Bullet Hell · Shoot 'Em Up · Top-Down
Hotline Miami
Shared: Action · Top-Down · Indie
12 is Better Than 6
Shared: Action · Hand-drawn · Shooter
Chippy
Shared: Bullet Hell · Shoot 'Em Up · Top-Down Shooter
Slime 3K: Rise Against Despot
Shared: Bullet Hell · Shoot 'Em Up · Roguelike
Halls of Torment
Shared: Bullet Hell · Action · Roguelike
ZeroRanger
Shared: Shoot 'Em Up · Bullet Hell · Action
Touhou Juuouen 〜 Unfinished Dream of All Living Ghost.
Shared: Shoot 'Em Up · Action · Bullet Hell
Megabonk
Shared: Roguelike · Bullet Hell · Action
Touhou Kinjoukyou ～ Fossilized Wonders.
Shared: Shoot 'Em Up · Bullet Hell · Action
Touhou Koumakyou: New Classic - the Embodiment of Scarlet Devil
Shared: Shoot 'Em Up · Bullet Hell · Action