Games like Nemo Dungeon
Games like Nemo Dungeon include Enter the Gungeon, Hades, The Binding of Isaac: Rebirth, Noita, and Hades II. We matched them by the tags players give Nemo Dungeon on Steam (Indie, Action, Dungeon Crawler, Difficult, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Enter the Gungeon
Shared: Bullet Hell · Indie · Difficult

Hades
Shared: Indie · Action · Roguelite

The Binding of Isaac: Rebirth
Shared: Indie · Roguelike · Difficult

Noita
Shared: Difficult · Dungeon Crawler · Roguelike

Hades II
Shared: Action · Roguelike · Roguelite

Nuclear Throne
Shared: Indie · Roguelike · Difficult

Megabonk
Shared: Indie · Roguelike · Bullet Hell

Skul: The Hero Slayer
Shared: Indie · Action · Roguelike

The Binding of Isaac
Shared: Indie · Roguelike · Difficult

Vampire Survivors
Shared: Bullet Hell · Indie · Roguelite

Dungreed
Shared: Action · Indie · Roguelike

Star of Providence
Shared: Indie · Bullet Hell · Roguelite

Gunfire Reborn
Shared: Roguelike · Roguelite · Indie

Tiny Rogues
Shared: Bullet Hell · Difficult · Dungeon Crawler

SYNTHETIK: Legion Rising
Shared: Indie · Action · Roguelite

Crypt of the NecroDancer
Shared: Indie · Dungeon Crawler · Roguelike

Wizard of Legend
Shared: Dungeon Crawler · Roguelike · Action

Risk of Rain 2
Shared: Action · Roguelike · Roguelite

Risk of Rain (2013)
Shared: Indie · Action · Roguelike

Darkest Dungeon®
Shared: Dungeon Crawler · Roguelike · Difficult

BALL x PIT
Shared: Action · Bullet Hell · Roguelite

Ravenswatch
Shared: Action · Roguelike · Indie

Dandy Ace
Shared: Indie · Action · Dungeon Crawler

Halls of Torment
Shared: Bullet Hell · Roguelite · Action