Games like Luna & Sol: Nightmare Ward
Games like Luna & Sol: Nightmare Ward include Shape of Dreams, Hades, Orcs Must Die! 3, Hades II, and Orcs Must Die! 2. We matched them by the tags players give Luna & Sol: Nightmare Ward on Steam (Action, Roguelite, Strategy, Tower Defense, and MOBA): closest matches first, and among equally close ones the better-known games.

Shape of Dreams
Shared: Roguelite · Action Roguelike · Action

Hades
Shared: Roguelite · Action · Action Roguelike

Orcs Must Die! 3
Shared: Tower Defense · Strategy · Action

Hades II
Shared: Action · Roguelite · Action Roguelike

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

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

Megabonk
Shared: Roguelite · Action Roguelike · Action

UnderMine
Shared: Roguelite · Action Roguelike · Action

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Action

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

Orcs Must Die! Deathtrap
Shared: Roguelite · Tower Defense · Action

Touhou Dystopian
Shared: Action · Roguelite · Action Roguelike

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

Devil Slayer - Raksasi
Shared: Action · Action Roguelike · Roguelite

Necrosmith
Shared: Roguelite · Tower Defense · Action Roguelike

Predecessor
Shared: Action · MOBA · Strategy

SMITE 2
Shared: Action · MOBA · Strategy

Monsters are Coming!
Shared: Action · Roguelite · Tower Defense

Tomb Raider Game of the Year
Shared: Action · Adventure · Female Protagonist

Vampire Survivors
Shared: Roguelite · Action Roguelike · Action

Bloons TD 6
Shared: Strategy · Tower Defense · 3D

Cult of the Lamb
Shared: Action Roguelike · Roguelite · Strategy

SMITE®
Shared: Action · MOBA · Strategy

Rise of the Tomb Raider™
Shared: Action · Adventure · Female Protagonist