Games like Alien Strike: Blasting the Intruders
Games like Alien Strike: Blasting the Intruders include Huntdown, SANABI, Broforce, Shovel Knight: Treasure Trove, and Blazing Chrome. We matched them by the tags players give Alien Strike: Blasting the Intruders on Steam (Aliens, Retro, Pixel Graphics, Shoot 'Em Up, and Side Scroller): closest matches first, and among equally close ones the better-known games.

Huntdown
Shared: Pixel Graphics · Side Scroller · Shoot 'Em Up

SANABI
Shared: Pixel Graphics · Cyberpunk · Action

Broforce
Shared: Pixel Graphics · Action · Side Scroller

Shovel Knight: Treasure Trove
Shared: Retro · Pixel Graphics · Platformer

Blazing Chrome
Shared: Retro · Pixel Graphics · Side Scroller

Katana ZERO
Shared: Pixel Graphics · Action · Cyberpunk

Guns of Fury
Shared: Pixel Graphics · Retro · Shoot 'Em Up

METAL SLUG 3
Shared: Retro · Side Scroller · Action

METAL SLUG
Shared: Side Scroller · Retro · Action

METAL SLUG X
Shared: Retro · Action · Shoot 'Em Up

Sonic Mania
Shared: Retro · Pixel Graphics · Platformer

Bloodstained: Curse of the Moon
Shared: Retro · Pixel Graphics · Action

Warhammer 40,000: Boltgun
Shared: Retro · Pixel Graphics · Old School

Axiom Verge
Shared: Pixel Graphics · Retro · Action

Door Kickers: Action Squad
Shared: Pixel Graphics · Retro · Action

Contra Anniversary Collection
Shared: Retro · Side Scroller · Action

The Messenger
Shared: Retro · Pixel Graphics · Platformer

UFO 50
Shared: Retro · Pixel Graphics · Action

NINJA GAIDEN: Ragebound
Shared: Pixel Graphics · Retro · Action

Sonic Origins
Shared: Retro · Pixel Graphics · Action

UBERMOSH
Shared: Pixel Graphics · Cyberpunk · Action

Terminator 2D: NO FATE
Shared: Pixel Graphics · Side Scroller · Retro

Contra: Operation Galuga
Shared: Action · Shoot 'Em Up · Side Scroller

Downwell
Shared: Pixel Graphics · Platformer · Retro