Indie

M.A.S.S. Builder

85% positive of 3,733 Steam reviews

Main story: Unknown
Everything: Unknown
Released: 2025
Steam Deck: Playable
Known on: Steam

Made by Vermillion Digital. Published by Sekai Project.

About the game

Commander, customize and build your Mechanical Assault Skeleton Suit (M.A.S.S.) and lead the fight against an alien invasion bent on exterminating the human race. The fate of humanity is in your hands.

What sets it apart

Mechs
Gun Customization
Robots
Action RPG
Character Customization
Hack and Slash
Third-Person Shooter
Futuristic
Post-apocalyptic
Beat 'em up
Combat
Sci-fi

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Indie

M.A.S.S. Builder

85% positive of 3,733 Steam reviews

See it on Steam

Main story: Unknown
Everything: Unknown
Released: 2025
Steam Deck: Playable
Known on: Steam

Made by Vermillion Digital. Published by Sekai Project.

About the game

What sets it apart

Mechs
Gun Customization
Robots
Action RPG
Character Customization
Hack and Slash
Third-Person Shooter
Futuristic
Post-apocalyptic
Beat 'em up
Combat
Sci-fi

What players say

Recommended
Its a nice lil mech builder but the game is kinda dead, also ou can make some really great looking mechs, but you also have to play through the entire game to unlock everything (parts farm) ehh
38 h played when written. 2 found it helpful.
Read on Steam
Recommended
It's a mech-builder game, and it's cheap. The combat is average; light and floaty and handles more like a dynasty warriors game. You feel more like you're playing as a some dude wear mech-flavored armor. Despite there being no advantages or disadvantages to making a cool mech, if you like making your favorite mech (Gundam, Transformers, Macross, Patlabor, Pacific Rim, etc...) you can do it here, with better results…
225 h played when written. 1 found it helpful.
Read on Steam
Not recommended
TLDR: i cannot recommend this game. keep looking for another Mech game unless you are a masochist. this game isn't beginner friendly nor very fun and quite repetitive. the designing of mechs and the weapons can be Ok yet is not intuitive, nor as accessible as say mechwarrior or armored core. to unlock parts to build your dream mech, be prepared to grind and suffer (and not in a good way). THE BAD: #1- The targeting…
24 h played when written. 0 found it helpful.
Read on Steam