24 games ranked by how much the tags Steam players vote on them overlap with Steam Marines's. A rare tag counts for far more than one that sits on half the store, and popularity never moves a game up.
What they share most: Rogue-like, Turn-Based, Turn-Based Strategy, Tactical, Space, Perma Death.

1·Bionic Dues
92% match · Rogue-like, Turn-Based
75% of 996 reviews positive

2·FTL: Faster Than Light
91% match · Rogue-like, Space
95% of 78,898 reviews positive · 677 playing

3·Weird Worlds: Return to Infinite Space
89% match · Rogue-like, Perma Death
66% of 624 reviews positive

4·1Quest
89% match · Rogue-like, Turn-Based
54% of 176 reviews positive

5·Desktop Dungeons
88% match · Rogue-like, Turn-Based
84% of 2,364 reviews positive

6·Runestone Keeper
88% match · Rogue-like, Strategy
84% of 2,464 reviews positive

7·Crowntakers
88% match · Rogue-like, Perma Death
73% of 689 reviews positive

8·Space Grunts
86% match · Rogue-like, Perma Death
81% of 78 reviews positive

9·Out There: Ω Edition
86% match · Rogue-like, Space
76% of 1,733 reviews positive

10·Battlevoid: Harbinger
86% match · Rogue-like, Space
79% of 1,059 reviews positive

11·Road Not Taken
86% match · Rogue-like, Turn-Based
80% of 357 reviews positive

12·Unalive
85% match · Rogue-like, Perma Death
72% of 384 reviews positive

13·The Long Journey Home
85% match · Rogue-like, Space
59% of 1,934 reviews positive

14·Quasimorph
85% match · Rogue-like, Perma Death
83% of 8,378 reviews positive

15·Crown Trick
84% match · Rogue-like, Perma Death
85% of 5,397 reviews positive

16·Dungeon of gain
84% match · Rogue-like, Procedural Generation
26% of 92 reviews positive

17·Flotilla
84% match · Rogue-like, Turn-Based
82% of 243 reviews positive

18·Distant Star: Revenant Fleet
84% match · Rogue-like, Procedural Generation
66% of 298 reviews positive

19·Dungeon of the ENDLESS™
84% match · Rogue-like, Perma Death
85% of 14,062 reviews positive

20·Skyshine's BEDLAM
84% match · Rogue-like, Turn-Based
59% of 879 reviews positive

21·Halfway
83% match · Turn-Based, Strategy
72% of 1,018 reviews positive

22·Space Rogue
82% match · Rogue-like, Space
64% of 453 reviews positive

23·Heat Signature
82% match · Rogue-like, Space
94% of 7,430 reviews positive

24·Renowned Explorers: International Society
81% match · Rogue-like, Turn-Based
92% of 2,910 reviews positive
The closest matches to Steam Marines on Steam are Bionic Dues, FTL: Faster Than Light, Weird Worlds: Return to Infinite Space, 1Quest, Desktop Dungeons. They rank highest because their Steam community tags overlap most with Steam Marines's, and shared tags include Rogue-like, Turn-Based, Turn-Based Strategy.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Rogue-like, Turn-Based, Turn-Based Strategy count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Steam Marines's. Popularity never affects the ranking.