Games like Dextram
Games like Dextram include Nova Drift, Bit Blaster XL, Planes, Bullets and Vodka, Deep Rock Galactic: Survivor, and Chippy. We matched them by the tags players give Dextram on Steam (Score Attack, Arena Shooter, Bullet Hell, Shoot 'Em Up, and Bullet Heaven): closest matches first, and among equally close ones the better-known games.

Nova Drift
Shared: Bullet Hell · Shoot 'Em Up · Arena Shooter

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

Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Bullet Hell · Action

Deep Rock Galactic: Survivor
Shared: Bullet Hell · Bullet Heaven · Arena Shooter

Chippy
Shared: Bullet Hell · Arena Shooter · Shoot 'Em Up

Brotato
Shared: Bullet Hell · Bullet Heaven · Arena Shooter

Megabonk
Shared: Bullet Heaven · Bullet Hell · Action

BALL x PIT
Shared: Bullet Hell · Action · Arcade

LUFTRAUSERS
Shared: Bullet Hell · Arcade · Shoot 'Em Up

Savant - Ascent
Shared: Score Attack · Action · Shoot 'Em Up

HYPER DEMON
Shared: Arena Shooter · Score Attack · Bullet Hell

Ikaruga
Shared: Bullet Hell · Shoot 'Em Up · Arcade

Swarmlake
Shared: Action · Score Attack · Bullet Hell

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

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

Vampire Survivors
Shared: Bullet Hell · Arcade · Action

Geometry Arena
Shared: Arena Shooter · Bullet Heaven · Bullet Hell

Sky Force Reloaded
Shared: Shoot 'Em Up · Bullet Hell · Arcade

Furi
Shared: Bullet Hell · Shoot 'Em Up · Difficult

Time Wasters
Shared: Bullet Hell · Bullet Heaven · Arena Shooter

Super Hexagon
Shared: Difficult · Arcade · Score Attack

Orbt XL
Shared: Arcade · Score Attack · Difficult

Cyberhunt
Shared: Shoot 'Em Up · Action · Arcade

Geometry Wars: Retro Evolved
Shared: Arcade · Bullet Hell · Shoot 'Em Up