Games like fishTDX
Games like fishTDX include Vampire Survivors, BALL x PIT, Necrosmith, Halls of Torment, and Megabonk. We matched them by the tags players give fishTDX on Steam (Tower Defense, Roguelike, Auto Battler, Bullet Hell, and Turn-Based Tactics): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Bullet Hell · Roguelite · Roguelike

BALL x PIT
Shared: Roguelike · Bullet Hell · Roguelite

Necrosmith
Shared: Tower Defense · Bullet Hell · Roguelite

Halls of Torment
Shared: Bullet Hell · Roguelike · Roguelite

Megabonk
Shared: Roguelike · Bullet Hell · Roguelite

Wall World
Shared: Tower Defense · Roguelike · Roguelite

9 Kings
Shared: Auto Battler · Roguelike · Strategy

Cluckmech Oasis
Shared: Roguelike · Tower Defense · Strategy

Super Fantasy Kingdom
Shared: Roguelike · Auto Battler · Strategy

Balatro
Shared: Roguelike · Strategy · Roguelite

Death Must Die
Shared: Bullet Hell · Roguelite · Roguelike

Rogue Tower
Shared: Tower Defense · Roguelike · Strategy

Luck be a Landlord
Shared: Roguelite · Roguelike · Strategy

Astro Prospector
Shared: Roguelike · Bullet Hell · Roguelite

Heretic's Fork
Shared: Tower Defense · Strategy · Roguelite

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

SHOOPER NOVA
Shared: Bullet Hell · Tower Defense · Roguelite

Darkest Dungeon® II
Shared: Turn-Based Tactics · Roguelite · Roguelike

Despot's Game: Dystopian Battle Simulator
Shared: Auto Battler · Roguelike · Turn-Based Tactics

Into the Breach
Shared: Roguelike · Strategy · Turn-Based Tactics

Noobs Want to Live
Shared: Roguelike · Bullet Hell · Roguelite

Rogue: Genesia
Shared: Bullet Hell · Roguelite · Roguelike

Slay the Spire 2
Shared: Roguelike · Strategy · Turn-Based Combat

Tower Dominion
Shared: Tower Defense · Roguelike · Strategy