M.A.S.S. Builder

by Vermillion Digital·published by Sekai Project

Steam · Very Positive

Steam Facts

Data current as of Apr 22, 2026. We re-crawl reviews and metadata every 14 days.

Steam Sentiment86

Very Positive

This puts the game in the top 30% of all reviewed games on Steam.

Quick Stats

Reviews

2,423en

4,043 total (all languages)

Current as of Apr 22, 2026

Released

Sep 14, 2025

Price

$24.99

Velocity

0.3/day

Slowing

Metadata current as of May 4, 2026 · Source: Steam

Market Reach

Estimated owners±100%Small-sample

≈130K

Estimated gross revenue±100%Small-sample

≈$4.9M

Based on 4,043 reviews (all languages)

boxleiter_v2

Based on review count × genre/age/price-adjusted Boxleiter ratio. Gross revenue before Steam’s 30% cut, refunds, and regional pricing.

About

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.

Sentiment History

Sentiment over time

Playtime Sentiment

Sentiment by time invested

· 87 post-launch reviews

40%5 rev

<2h

20%5 rev

2-10h

50%18 rev

10-50h

58%36 rev

50-200h

65%17 rev

200h+

67%6 rev

Players who invest more time rate this game significantly higher (+45pts) — a strong signal of a slow-burn experience that rewards patience.

Competitive Benchmark

Compared to 644 similar games in the Action genre released in 2025.

Sentiment vs. similar gamesBottom 49%

Popularity vs. similar gamesTop 13%

Get more analyses like M.A.S.S. Builder

Free reports today. Pro launches soon. No spam.

View on Steam Store →