Games like Scrappage
Games like Scrappage include Megabonk, Enter the Gungeon, Brotato, Pathogenic, and Rogue: Genesia. We matched them by the tags players give Scrappage on Steam (Action Roguelike, Bullet Heaven, Bullet Hell, Twin Stick Shooter, and Local Co-Op): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Local Co-Op

Brotato
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Pathogenic
Shared: Bullet Hell · Bullet Heaven · Action Roguelike

Rogue: Genesia
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Local Co-Op

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Roguelike

Death Must Die
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Neon Abyss
Shared: Bullet Heaven · Loot · Roguelike

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Tower of Babel: Survivors of Chaos
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Dead Estate
Shared: Action Roguelike · Twin Stick Shooter · Bullet Hell

The Spell Brigade
Shared: Bullet Heaven · Bullet Hell · Action Roguelike

Halls of Torment
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Voidigo
Shared: Action Roguelike · Twin Stick Shooter · Bullet Hell

Nordic Ashes: Survivors of Ragnarok
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Atomicrops
Shared: Bullet Hell · Action Roguelike · Bullet Heaven

Time Wasters
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Deadly Days: Roadtrip
Shared: Bullet Heaven · Action Roguelike · Local Co-Op

SYNTHETIK 2
Shared: Action Roguelike · Twin Stick Shooter · Perma Death

Risk of Rain 2
Shared: Action Roguelike · Loot · Roguelike

The Binding of Isaac
Shared: Action Roguelike · Roguelike · Procedural Generation

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Indie