Games like Terralysia
Games like Terralysia include Megabonk, Soulstone Survivors, Vampire Survivors, The Spell Brigade, and BALL x PIT. We matched them by the tags players give Terralysia on Steam (Bullet Heaven, Action Roguelike, Third Person, Action, and Arcade): closest matches first, and among equally close ones the better-known games.

Megabonk
Shared: Bullet Heaven · Action Roguelike · Roguelite

Soulstone Survivors
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Vampire Survivors
Shared: Action Roguelike · Bullet Hell · Roguelite

The Spell Brigade
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

BALL x PIT
Shared: Action · Arcade · Action Roguelike

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

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

Brotato
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Rogue: Genesia
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Nova Drift
Shared: Action Roguelike · Bullet Hell · Arcade

Yet Another Zombie Survivors
Shared: Bullet Heaven · Action Roguelike · Arcade

Tower of Babel: Survivors of Chaos
Shared: Bullet Heaven · Action Roguelike · Bullet Hell

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Hades
Shared: Action Roguelike · Roguelite · Action

Boneraiser Minions
Shared: Action Roguelike · Bullet Hell · Bullet Heaven

Crab Champions
Shared: Action Roguelike · Arcade · Roguelike

Atomicrops
Shared: Action · Action Roguelike · Bullet Hell

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

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelite

Project Lazarus
Shared: Action Roguelike · Action · Bullet Heaven

Touhou Dystopian
Shared: Action Roguelike · Action · Third Person

Be My Horde
Shared: Action Roguelike · Bullet Heaven · Bullet Hell

Conquest Dark
Shared: Bullet Heaven · Action · Action Roguelike

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