Games like 3100: Stormwake
Games like 3100: Stormwake include Bit Blaster XL, Vampire Survivors, Planes, Bullets and Vodka, BALL x PIT, and Cyberhunt. We matched them by the tags players give 3100: Stormwake on Steam (Action, Casual, Action-Adventure, Arcade, and Bullet Hell): closest matches first, and among equally close ones the better-known games.

Bit Blaster XL
Shared: Bullet Hell · Arcade · Shoot 'Em Up

Vampire Survivors
Shared: Bullet Hell · Casual · 2D

Planes, Bullets and Vodka
Shared: Action · Casual · Bullet Hell

BALL x PIT
Shared: Action · Arcade · Bullet Hell

Cyberhunt
Shared: Action · Casual · Arcade

Nova Drift
Shared: Bullet Hell · Arcade · Shoot 'Em Up

LUFTRAUSERS
Shared: Action · Arcade · Bullet Hell

Super Bit Blaster XL
Shared: Bullet Hell · Arcade · Action

Star Saviors
Shared: Action · Bullet Hell · Shoot 'Em Up

Beat Hazard
Shared: Bullet Hell · Shoot 'Em Up · Action

Ikaruga
Shared: Action · Arcade · Bullet Hell

Orbt XL
Shared: Arcade · Action · Casual

ZeroRanger
Shared: Action · Bullet Hell · Shoot 'Em Up

Chicken Invaders Universe
Shared: Action · Casual · Shoot 'Em Up

Timberman
Shared: Casual · Action · Arcade

Chicken Invaders 5
Shared: Action · Casual · Shoot 'Em Up

TouHou Makuka Sai ~ Fantastic Danmaku Festival
Shared: Action · Bullet Hell · Casual

Megabonk
Shared: Action · Bullet Hell · Arcade

Shower With Your Dad Simulator 2015: Do You Still Shower With Your Dad
Shared: Arcade · Casual · Action

Geometry Wars: Retro Evolved
Shared: Casual · Arcade · Bullet Hell

SUPER CHICKEN JUMPER
Shared: Arcade · Action-Adventure · 2D

Exit the Gungeon
Shared: Action · Arcade · Bullet Hell

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

Starblast
Shared: Action · Casual · Arcade

