Games like Xenmega
Games like Xenmega include Huntdown, Bit Blaster XL, Planes, Bullets and Vodka, Broforce, and METAL SLUG. We matched them by the tags players give Xenmega on Steam (Side Scroller, Shoot 'Em Up, Action, Casual, and Shooter): closest matches first, and among equally close ones the better-known games.

Huntdown
Shared: Side Scroller · Action · Shooter

Bit Blaster XL
Shared: Shoot 'Em Up · Shooter · Arcade

Planes, Bullets and Vodka
Shared: Shoot 'Em Up · Action · Casual

Broforce
Shared: Action · 2D · Side Scroller

METAL SLUG
Shared: Action · Side Scroller · Shoot 'Em Up

METAL SLUG 3
Shared: Action · Side Scroller · Arcade

Alex Jones: NWO Wars
Shared: Action · Shoot 'Em Up · Side Scroller

Blazing Chrome
Shared: Action · Side Scroller · Shoot 'Em Up

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

Cyberhunt
Shared: Action · Casual · Shoot 'Em Up

Vampire Survivors
Shared: 2D · Casual · Action

DRAINUS
Shared: Shoot 'Em Up · Action · Shooter

pureya
Shared: Casual · Arcade · Side Scroller

METAL SLUG 2
Shared: Action · Side Scroller · Shoot 'Em Up

Teenage Mutant Ninja Turtles: Shredder's Revenge
Shared: Side Scroller · 2D · Action

Kero Blaster
Shared: Side Scroller · Shoot 'Em Up · Shooter

Guns, Gore & Cannoli
Shared: Side Scroller · Action · Shoot 'Em Up

LUFTRAUSERS
Shared: Action · Arcade · Shoot 'Em Up

Guns, Gore and Cannoli 2
Shared: Side Scroller · Action · Shoot 'Em Up

ZeroRanger
Shared: Shoot 'Em Up · Action · Arcade

Nova Drift
Shared: Shoot 'Em Up · Arcade · Shooter

Soda Crisis
Shared: Side Scroller · Action · Shoot 'Em Up

Streets of Rage 4
Shared: Action · Side Scroller · 2D

Super Bit Blaster XL
Shared: Shoot 'Em Up · Arcade · Action