Games like Nightmare Invasion
Games like Nightmare Invasion include Balatro, Slay the Spire 2, Slay the Spire, Loop Hero, and Monster Train. We matched them by the tags players give Nightmare Invasion on Steam (Strategy, Casual, Turn-Based Tactics, Deckbuilding, and Roguelite): closest matches first, and among equally close ones the better-known games.

Balatro
Shared: Strategy · Deckbuilding · Card Game

Slay the Spire 2
Shared: Strategy · Deckbuilding · Card Game

Slay the Spire
Shared: Strategy · Deckbuilding · Card Game

Loop Hero
Shared: Deckbuilding · Roguelite · Roguelike

Monster Train
Shared: Roguelite · Deckbuilding · Turn-Based Tactics

RACCOIN: Coin Pusher Roguelike
Shared: Strategy · Deckbuilding · Casual

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

Rogue Tower
Shared: Strategy · Casual · Tower Defense

Slots & Daggers
Shared: Strategy · Casual · Roguelike

Ratropolis
Shared: Deckbuilding · Strategy · Roguelite

Inscryption
Shared: Deckbuilding · Card Game · Strategy

Emberward
Shared: Strategy · Tower Defense · Deckbuilding

Ballionaire
Shared: Casual · Strategy · Deckbuilding

9 Kings
Shared: Strategy · Deckbuilding · Card Game

Peglin
Shared: Deckbuilding · Strategy · Roguelite

Dungeons & Degenerate Gamblers
Shared: Strategy · Deckbuilding · Roguelike

Luck be a Landlord
Shared: Strategy · Deckbuilding · Roguelite

Plants vs. Zombies GOTY Edition
Shared: Strategy · Casual · Tower Defense

Dota Underlords
Shared: Strategy · Casual · Turn-Based Tactics

DICEOMANCER
Shared: Strategy · Card Game · Deckbuilding

Vampire Crawlers: The Turbo Wildcard from Vampire Survivors
Shared: Strategy · Deckbuilding · Roguelike

Vampire Survivors
Shared: Roguelite · Casual · 2D

Roguebook
Shared: Strategy · Deckbuilding · Card Game

The King is Watching
Shared: Strategy · Tower Defense · Roguelike