Games like M.A.S.S. Builder on Steam
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DAEMON X MACHINA
Pilot your fully customizable Arsenal mech and join your fellow mercenaries in defending humanity from the corrupted machines and gigantic robots in this post-apocalyptic action game!
SD GUNDAM BATTLE ALLIANCE
SD Gundam Battle Alliance is a multiplayer Gundam action RPG where you can smash foes solo or with friends in thrilling mechanized combat. Acquire new mobile suits, power them up, and take them into battle in various missions!
Dolls Nest
Dolls Nest is a 3D action game where you can customize mecha girls and explore a ruined world. As a Frame Unit, your adventure will pit you against the gigantic autonomous factory world of Hod. Overcome obstacles using the parts at your disposal and uncover the mysteries that lie at its center.
EVERSLAUGHT
Traverse an ancient city with randomly generated dungeons, discover rare loot, upgrade your gear, level up your skills and engage in visceral combat with completely unrestricted VR movement!
BREAK ARTS II
Faster than anyone. Stronger than anyone. And more stunning. Customize your robot for “cyber battle racing” in a game that offers all the thrills of racing, battle, and customization. Online, Offline, Time-Attack... which mode will you dominate?!
Project Nimbus: Complete Edition
Project Nimbus is a high speed mech action game set in a post apocalyptic world. Players control 'Battle Frames' - humanoid battle suits armed with an arsenal of weapons.
GUNDAM BREAKER 4
Create your own ultimate Gundam in the newest Gundam Breaker! With more customizable parts than ever before, you finally have the freedom to build your perfect Gunpla. Test it in battle using the brand new dual-weapon system and break parts off of your enemies and add them to your collection.
ARMORED CORE™ VI FIRES OF RUBICON™
A new action game based on the concept of the ARMORED CORE series that uses the knowledge gained from FromSoftware's recent action game development.
Ghostlore
Ghostlore is an 'Eastpunk' Action-RPG where you fight supernatural monsters from Southeast-Asian folklore. Inspired by classic ARPGs such as Diablo 2 and Titan Quest, Ghostlore features detailed item and character customization systems, procedurally generated maps, and awesome 90's retro graphics.
War Tech Fighters
War Tech Fighters - the space action game that combines the spectacular action of Japanese Anime with Hollywood Blockbusters. Configure, upgrade and customize your War Tech and dive into battle to fight back the Zatronian forces and save your galaxy!
Apex Aim Trainer
Improve Your Aim in Apex Legends
Front Mission Evolved
Experience piloting and customizing massive armored units called Wanzers while engaging in high-intensity battles driven by a compelling story. The battle begins now!
HARDCORE MECHA
HARDCORE MECHA is a 2D platformer action focusing on a better handling. The Campaign mode offers rich gameplay and seamless in-game cut-scenes for an immersive experience. Choose your favorite mecha, experience the fast-paced hardcore competitive battle of steel in Multiplayer!
Monomyth
MONOMYTH is an immersive, first-person dungeon-crawling RPG inspired by the genre's late classics. Embark on a journey through a vast and highly interactive game world as you unravel the mysteries hidden beneath the ancient fortress of Lysandria.
Relic Hunters Legend
A Top-Down Shooter/Looter RPG with a touching story inspired by JRPG classics. Shoot enemies, get loot, and customize your characters. Multiple endgame systems and over 100 hours of play await you solo or up to 4-player co-op!
Mecha Knights: Nightmare
Mecha action shooter, plunging the player into an apocalyptic war. Engage in epic battles with endless hordes of monsters in your powerful customizable mechs.
Mahou Arms
Mahou Arms is an anime-inspired character-action hack and slash that tells the story of a magical girl paramilitary group fighting back against an alien invasion.
Gun Metal
Gun Metal is a futuristic action-packed experience where you take control of the fully transformable prototype combat vehicle known as the Havoc Suit.The Havoc Suit, a prototype combat vehicle, remains the only hope to save civilization from a tireless enemy.
Metal Bringer
In this roguelike action-adventure, control humanoid "Labor" and giant "Arms" to uncover the mysteries of the world. Create fully-customizable robots, strengthen them, and take down hordes of enemies!
No Rest for the Wicked
From Moon Studios, the award-winning developers of Ori and the Blind Forest and Ori and the Will of the Wisps comes No Rest for the Wicked, a visceral, precision Action RPG set to reinvent the genre.
Gunjitsu
Gunjitsu is a fast-paced platform shooter with grappling hooks, rocket launchers, guns and grenades! Kill your opponents or race them for the fastest time. Inspirations from old platform shooters gives Gunjitsu a classic feel while modern tech takes it to a new level of frantic action!
MOBILE SUIT GUNDAM SEED BATTLE DESTINY REMASTERED
Become a pilot in the world of Mobile Suit Gundam SEED, for the first time available with English localization! Engage in thrilling, action-packed Gundam battles, complete missions, and tune up your newly acquired Mobile Suits!