Games like Alien Raid
Games like Alien Raid include Escape From Duckov, Caster, Grand Theft Auto V Legacy, s&box, and OUTRIDERS. We matched them by the tags players give Alien Raid on Steam (Casual, Adventure, Racing, RPG, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

Escape From Duckov
Shared: Adventure · Shooter · Top-Down Shooter

Caster
Shared: Adventure · Casual · RPG

Grand Theft Auto V Legacy
Shared: Adventure · Shooter · Racing

s&box
Shared: Casual · Shooter · 3D Platformer

OUTRIDERS
Shared: RPG · Adventure · Third-Person Shooter

Crab Champions
Shared: Action Roguelike · Casual · Third-Person Shooter

Juicy Realm
Shared: Adventure · Casual · RPG

Fallout 4
Shared: Adventure · RPG · Shooter

Kao the Kangaroo: Round 2 (2003 re-release)
Shared: Adventure · Casual · 3D Platformer

ATLYSS
Shared: RPG · Adventure · 3D Platformer

Melvor Idle
Shared: Casual · RPG · Adventure

REMNANT II®
Shared: Adventure · RPG · Shooter

DAVE THE DIVER
Shared: Casual · Adventure · RPG

Chained Together
Shared: Adventure · Casual · 3D Platformer

The Ascent
Shared: RPG · Top-Down Shooter · Shooter

20 Minutes Till Dawn
Shared: Action Roguelike · Top-Down Shooter · Casual

Grand Theft Auto V Enhanced
Shared: Adventure · Shooter · Racing

Ratchet & Clank: Rift Apart
Shared: Adventure · 3D Platformer · Third-Person Shooter

Warhammer 40,000: Space Marine 2
Shared: Adventure · Third-Person Shooter · RPG

Home Behind
Shared: Adventure · RPG · Casual

Goobies
Shared: Action Roguelike · Casual · Top-Down Shooter

Remnant: From the Ashes
Shared: Adventure · RPG · Shooter

Haste
Shared: 3D Platformer · Racing · Adventure

Tomb Raider Game of the Year
Shared: Adventure · Third-Person Shooter · Third Person