Games like Fallen Force
Games like Fallen Force include Vampire Survivors, BALL x PIT, 20 Minutes Till Dawn, Halls of Torment, and Deep Rock Galactic: Survivor. We matched them by the tags players give Fallen Force on Steam (Action Roguelike, Arena Shooter, Bullet Hell, Shoot 'Em Up, and Action): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

BALL x PIT
Shared: Action · Bullet Hell · Action Roguelike

20 Minutes Till Dawn
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

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

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Hell · Arena Shooter

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Action Roguelike

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

Nuclear Throne
Shared: Action Roguelike · Bullet Hell · Action

Star of Providence
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Glyphica: Typing Survival
Shared: Action Roguelike · Arena Shooter · Bullet Hell

Enter the Gungeon
Shared: Action Roguelike · Bullet Hell · Pixel Graphics

I Am Legion: Stand Survivors
Shared: Action Roguelike · Bullet Hell · Shoot 'Em Up

Brotato
Shared: Action Roguelike · Bullet Hell · Arena Shooter

SNKRX
Shared: Action Roguelike · Arena Shooter · Shoot 'Em Up

Time Wasters
Shared: Action Roguelike · Bullet Hell · Arena Shooter

Megabonk
Shared: Action Roguelike · Bullet Hell · Roguelite

Skul: The Hero Slayer
Shared: Action Roguelike · Action · Pixel Graphics

Arms of God
Shared: Action Roguelike · Bullet Hell · Arena Shooter

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

Tiny Rogues
Shared: Action Roguelike · Bullet Hell · Top-Down Shooter

Noobs Are Coming
Shared: Action Roguelike · Arena Shooter · Bullet Hell

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Roguelite

FatalZone
Shared: Action Roguelike · Bullet Hell · Arena Shooter

Necrosmith
Shared: Action Roguelike · Bullet Hell · Strategy