Games like Wild Seas
Games like Wild Seas include Vampire Survivors, Enter the Gungeon, BALL x PIT, Halls of Torment, and Megabonk. We matched them by the tags players give Wild Seas on Steam (Action, Strategy, Tower Defense, Bullet Hell, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

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

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

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

Megabonk
Shared: Action Roguelike · Bullet Hell · Action

Monsters are Coming!
Shared: Action · Tower Defense · Bullet Hell

Nuclear Throne
Shared: Action Roguelike · Action · Bullet Hell

Necrosmith
Shared: Tower Defense · Action Roguelike · Strategy

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Indie

Thronefall
Shared: Strategy · Tower Defense · Action

GemCraft - Chasing Shadows
Shared: Strategy · Tower Defense · Action

Cluckmech Oasis
Shared: Strategy · Tower Defense · Action

20 Minutes Till Dawn
Shared: Bullet Hell · Action Roguelike · Pixel Graphics

The Escapists
Shared: Strategy · Pixel Graphics · Action

Noobs Want to Live
Shared: Action · Bullet Hell · Pixel Graphics

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

Atomicrops
Shared: Action · Bullet Hell · Action Roguelike

Infested Planet
Shared: Strategy · Action · Tower Defense

Bloons TD 5
Shared: Strategy · Tower Defense · Action

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

Orcs Must Die!
Shared: Action · Tower Defense · Strategy

Hotline Miami
Shared: Action · Pixel Graphics · Indie

Orcs Must Die! 2
Shared: Action · Tower Defense · Strategy

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · Singleplayer