Games like Expanse
Games like Expanse include SYNTHETIK: Legion Rising, Nuclear Throne, The Ascent, Relic Hunters Zero: Remix, and Enter the Gungeon. We matched them by the tags players give Expanse on Steam (Action, Indie, Bullet Hell, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

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

Nuclear Throne
Shared: Indie · Action · Bullet Hell

The Ascent
Shared: Top-Down Shooter · Action · Co-op

Relic Hunters Zero: Remix
Shared: Action · Top-Down Shooter · Co-op

Enter the Gungeon
Shared: Bullet Hell · Indie · Action

The Spell Brigade
Shared: Bullet Hell · Co-op · Action

Cuphead
Shared: Co-op · Indie · Bullet Hell

Killsquad
Shared: Action · Top-Down Shooter · Co-op

Broforce
Shared: Action · Co-op · Indie

Sky Force Reloaded
Shared: Bullet Hell · Top-Down Shooter · Action

Gatekeeper
Shared: Co-op · Bullet Hell · Indie

Vampire Survivors
Shared: Bullet Hell · Indie · Action

BALL x PIT
Shared: Action · Bullet Hell · Top-Down Shooter

Just Shapes & Beats
Shared: Bullet Hell · Indie · Action

Police Stories
Shared: Action · Co-op · Top-Down Shooter

Guardians of Orion (Phase 2)
Shared: Action · Indie · Co-op

Windowkill
Shared: Action · Indie · Bullet Hell

Megabonk
Shared: Indie · Bullet Hell · Action

Rabbit and Steel
Shared: Bullet Hell · Co-op · Action

RUNNING WITH RIFLES
Shared: Action · Top-Down Shooter · Indie

HELLDIVERS™ Dive Harder Edition
Shared: Top-Down Shooter · Co-op · Action

RUINER
Shared: Action · Top-Down Shooter · Indie

Nation Red
Shared: Action · Indie · Top-Down Shooter

Gang Beasts
Shared: Action · Co-op · Indie