Games like M.A.S.S. Builder

This is a fast-paced action RPG where you build and customize mechanical suits to fight alien beasts. It features deep aesthetic and stat customization for your combat mech.

85% positive from 4,093 · 2025 · Steam Deck Playable · Lowest ever $13.99 (2026-04-27)

Early AccessAction RPG Mechs Character Customization RobotsGun Customization

Six games like M.A.S.S. Builder

Cavalry Girls

89% positive from 1,966 reviews2023Deck Playable

Top-down roguelike shooter with mecha customization and strategic resource management. Features an Ideology System influencing story and a Synthesis System for equipment.

The catchThe English translation is poor and stats and systems are barely explained.

Both are tagged Gun Customization, Mechs and Indie.

Games like Cavalry Girls →

Project Nimbus: Complete Edition

85% positive from 1,686 reviews20176% finish itDeck Unsupported

This is a high-speed mech action game featuring 360-degree aerial combat with diverse weaponry. Players pilot customizable Battle Frames through a war-torn future, engaging in fast-paced battles against bosses and enemy pilots.

The catchThe controls and lock on system are clumsy, and enemies constantly break your lock.

Both are tagged Mechs, Robots and Action.

Games like Project Nimbus: Complete Edition →

Mecha Knights: Nightmare

92% positive from 1,613 reviews2021Deck Playable

This is a single-player mech combat game featuring a narrative campaign and deep customization. Players pilot a Mobile Armor to fight hordes of monsters in a post-apocalyptic setting.

What players likedPlayers praise this game as an "Armored Core" meets "EDF" or "zombie defense" hybrid, offering fun, customizable mecha combat and a rich storyline.

The catchMissions blur together fast, with the same shallow enemies, maps and shooting throughout.

Both are tagged Mechs, Robots and Action.

Games like Mecha Knights: Nightmare →

Gun Metal

81% positive from 1,124 reviews2014

Third-person shooter with a transforming mech. Players engage in ground and aerial combat with a large arsenal.

What players likedPlayers praise "Gun Metal" as a "Transformers"-like mech action game with a fresh and fun transformation mechanic.

The catchControls and camera are clunky and floaty, making even basic movement awkward.

Both are tagged Mechs, Robots and Action.

Games like Gun Metal →

Death in the Water 2

83% positive from 1,811 reviews2023Deck Verified

Underwater survival horror shooter with wave-based combat against a mind-controlling kraken. Explore, upgrade weapons, and survive escalating tension in a treacherous open world.

What players likedPlayers praise its intense underwater horror, comparing it to Subnautica, for its beautiful yet terrifying atmosphere and engaging shooting gameplay.

The catchEvery dive repeats the same shooting gallery loop until it turns boring.

Both are tagged Gun Customization, Action and Indie.

Games like Death in the Water 2 →

Night Raider

86% positive from 1,949 reviews202419% finish itDeck Playable

Night Raider is a survival horror game where players scavenge for supplies and fight zombies, with permadeath and hostile human encounters. The core loop involves stealthy combat and resource management in a dark, post-apocalyptic world.

What players likedPlayers find it a deep, if grindy, experience with surprising depth for its price point.

The catchProgress is gated behind rare random drops, so the same map gets ground repeatedly.

Both are tagged Gun Customization and Indie.

Games like Night Raider →

More like this: Action RPG Character Customization Mechs Robots

More about M.A.S.S. Builder

What players liked

Players praise the deep mech customization and varied combat, reminiscent of other build-focused action games.

The catch

The mech building shines but combat is shallow, repetitive and full of bullet sponges.

Reviews: 85% positive from 4,093
Released: 2025
Steam Deck: Steam Deck Playable
Price: Lowest ever $13.99 (2026-04-27)
Play: Single-playerCo-opMulti-playerFull controller support

It is here because it sits in the band this site looks at: well reviewed at 85% positive, but with 4,093 reviews, far fewer than the household names carry.

View M.A.S.S. Builder on Steam

Or skip the lists entirely.

Describe what you feel like playing

This page was built automatically from stored Steam data. How these pages are made.