Games like MOLD-09
Games like MOLD-09 include Deep Rock Galactic: Survivor, Megabonk, BALL x PIT, Yet Another Zombie Survivors, and 20 Minutes Till Dawn. We matched them by the tags players give MOLD-09 on Steam (Action Roguelike, Bullet Heaven, Action, Top-Down Shooter, and Roguelite): closest matches first, and among equally close ones the better-known games.

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

Megabonk
Shared: Action Roguelike · Bullet Heaven · Roguelite

BALL x PIT
Shared: Action · Roguelite · Action Roguelike

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Top-Down Shooter

20 Minutes Till Dawn
Shared: Action Roguelike · Roguelite · Top-Down Shooter

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

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

SYNTHETIK: Legion Rising
Shared: Top-Down Shooter · Action Roguelike · Action

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Nuclear Throne
Shared: Action Roguelike · Action · Roguelite

SYNTHETIK 2
Shared: Action Roguelike · Top-Down Shooter · Roguelite

The Last Stand: Aftermath
Shared: Top-Down Shooter · Action Roguelike · Roguelite

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

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

Soulstone Survivors
Shared: Action Roguelike · Bullet Heaven · Roguelite

Vampire Survivors
Shared: Action Roguelike · Roguelite · Pixel Graphics

Arms of God
Shared: Action Roguelike · Bullet Heaven · Top-Down Shooter

Hades
Shared: Action Roguelike · Roguelite · Action

Shape of Dreams
Shared: Action Roguelike · PvE · Roguelite

Hotline Miami
Shared: Action · Top-Down · Pixel Graphics

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

UnderMine
Shared: Action Roguelike · Roguelite · Action

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

NIMRODS
Shared: Bullet Heaven · Action Roguelike · Top-Down Shooter