24 games ranked by how much the tags Steam players vote on them overlap with Space Grunts'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, Perma Death, Turn-Based, Space, Rogue-lite, Turn-Based Strategy.

1·Steam Marines
86% match · Rogue-like, Perma Death
50% of 333 reviews positive

2·Crown Trick
85% match · Perma Death, Rogue-lite
85% of 5,397 reviews positive

3·Super Turbo Demon Busters!
84% match · Futuristic, Rogue-lite
56% of 189 reviews positive

4·FTL: Faster Than Light
83% match · Perma Death, Rogue-like
95% of 78,898 reviews positive · 918 playing

5·Battlevoid: Harbinger
81% match · Space, Rogue-like
79% of 1,059 reviews positive

6·XCOM: Enemy Unknown
80% match · Turn-Based Strategy, Aliens
93% of 58,762 reviews positive · 521 playing

7·Templar Battleforce
80% match · Perma Death, Aliens
93% of 985 reviews positive

8·Halfway
79% match · Turn-Based, Turn-Based Strategy
72% of 1,018 reviews positive

9·Rencounter
79% match · Replay Value, Turn-Based Strategy
71% of 374 reviews positive

10·Sid Meier's Civilization®: Beyond Earth™
79% match · Turn-Based Strategy, Aliens
61% of 23,179 reviews positive

11·Weird Worlds: Return to Infinite Space
79% match · Perma Death, Rogue-like
66% of 624 reviews positive

12·DemonCrawl
78% match · Rogue-lite, Rogue-like
77% of 1,331 reviews positive

13·Tharsis
77% match · Perma Death, Rogue-lite
70% of 2,513 reviews positive

14·Dungeon of the ENDLESS™
77% match · Rogue-like, Perma Death
85% of 14,062 reviews positive

15·Pixel Heroes: Byte & Magic
77% match · Rogue-lite, Rogue-like
75% of 604 reviews positive

16·Bionic Dues
77% match · Rogue-like, Turn-Based
75% of 996 reviews positive

17·Unalive
77% match · Perma Death, Rogue-like
72% of 384 reviews positive

18·Crowntakers
77% match · Perma Death, Rogue-like
73% of 689 reviews positive

19·UFO: Extraterrestrials Gold
77% match · Aliens, Turn-Based Strategy
79% of 242 reviews positive · 3 playing

20·Renowned Explorers: International Society
77% match · Turn-Based, Turn-Based Strategy
92% of 2,910 reviews positive

21·Space Rogue
76% match · Space, Rogue-like
64% of 453 reviews positive

22·Interplanetary
76% match · Space, Turn-Based Strategy
79% of 804 reviews positive

23·Refactor
76% match · Rogue-lite, Futuristic
84% of 470 reviews positive

24·Heat Signature
76% match · Space, Rogue-like
94% of 7,430 reviews positive
The closest matches to Space Grunts on Steam are Steam Marines, Crown Trick, Super Turbo Demon Busters!, FTL: Faster Than Light, Battlevoid: Harbinger. They rank highest because their Steam community tags overlap most with Space Grunts's, and shared tags include Rogue-like, Perma Death, Turn-Based.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Rogue-like, Perma Death, Turn-Based count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Space Grunts's. Popularity never affects the ranking.