Games like Undead Under Night Rain
Games like Undead Under Night Rain include Broken Arrow, Plants vs. Zombies GOTY Edition, Aliens: Dark Descent, Men of War: Assault Squad 2, and They Are Billions. We matched them by the tags players give Undead Under Night Rain on Steam (Strategy, Tower Defense, Zombies, Rock Music, and Action): closest matches first, and among equally close ones the better-known games.

Broken Arrow
Shared: Strategy · Modern · RTS

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

Aliens: Dark Descent
Shared: Strategy · Action · RTS

Men of War: Assault Squad 2
Shared: Strategy · Action · RTS

They Are Billions
Shared: Strategy · Zombies · Tower Defense

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

Thronefall
Shared: Strategy · Tower Defense · Action

Total War: WARHAMMER III
Shared: Strategy · RTS · Action

Sudden Strike 4
Shared: Strategy · RTS · Real Time Tactics

Call to Arms
Shared: Strategy · Action · RTS

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · RTS

Total War: WARHAMMER II
Shared: Strategy · RTS · Action

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

DG2: Defense Grid 2
Shared: Strategy · Tower Defense · Action

Wargame: Red Dragon
Shared: Strategy · RTS · Realistic

Company of Heroes 3
Shared: Strategy · RTS · Action RTS

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · RTS · Real Time Tactics

Syrian Warfare
Shared: RTS · Strategy · Realistic

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Tactical · Real Time Tactics

Infested Planet
Shared: Strategy · Tower Defense · Action

Taur
Shared: Strategy · Tower Defense · Action

Total War: THREE KINGDOMS
Shared: Strategy · RTS · Action

Atom Zombie Smasher
Shared: Tower Defense · Zombies · Strategy

Warhammer Age of Sigmar: Realms of Ruin
Shared: Strategy · Action · RTS