Games like Aliens Are Rude!
Games like Aliens Are Rude! include Skul: The Hero Slayer, Rogue Legacy, Hades, Risk of Rain (2013), and Hades II. We matched them by the tags players give Aliens Are Rude! on Steam (Action, Indie, Strategy, Platformer, and Roguelike): closest matches first, and among equally close ones the better-known games.

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

Rogue Legacy
Shared: Indie · Platformer · Action

Hades
Shared: Indie · Action · Roguelite

Risk of Rain (2013)
Shared: Indie · Action · Roguelike

Hades II
Shared: Action · Roguelike · Roguelite

Rogue Legacy 2
Shared: Action · Platformer · Indie

Megabonk
Shared: Indie · Roguelike · Roguelite

Gunfire Reborn
Shared: Roguelike · Roguelite · Indie

Dungreed
Shared: Action · Roguelike · Indie

Slay the Spire 2
Shared: Roguelike · Strategy · Indie

Balatro
Shared: Roguelike · Strategy · Indie

Heat Signature
Shared: Indie · Action · Roguelike

FTL: Faster Than Light
Shared: Strategy · Roguelike · Indie

ScourgeBringer
Shared: Action · Indie · Roguelite

Vampire Survivors
Shared: Roguelite · Indie · Roguelike

Risk of Rain 2
Shared: Action · Roguelike · Roguelite

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

Spelunky
Shared: Platformer · Indie · Roguelike

The Binding of Isaac
Shared: Indie · Roguelike · Action

Slay the Spire
Shared: Roguelike · Strategy · Indie

Nuclear Throne
Shared: Indie · Roguelike · Action

Into the Breach
Shared: Strategy · Indie · Roguelike

Dead Cells
Shared: Roguelike · Roguelite · Platformer

Ravenswatch
Shared: Action · Roguelike · Indie