24 games ranked by how much the tags Steam players vote on them overlap with Space Prison'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: Strategy RPG, Crafting, Dungeon Crawler, Turn-Based Combat, Turn-Based Tactics, Grid-Based Movement.

1·Craft Hero
79% match · Strategy RPG, Crafting
83% of 412 reviews positive

2·Mercenaries Blaze
79% match · Turn-Based Tactics, Strategy RPG
76% of 580 reviews positive

3·The Dragoness: Command of the Flame
78% match · Grid-Based Movement, Turn-Based Tactics
69% of 174 reviews positive

4·Lost Eidolons: Veil of the Witch
77% match · Grid-Based Movement, Turn-Based Tactics
82% of 1,416 reviews positive

5·Mortal Glory 2
76% match · Grid-Based Movement, Turn-Based Tactics
88% of 308 reviews positive

6·TRIANGLE STRATEGY
76% match · Turn-Based Tactics, Strategy RPG
80% of 3,793 reviews positive

7·Capes
76% match · Comic Book, Grid-Based Movement
69% of 508 reviews positive

8·Sin Slayers: Reign of The 8th
76% match · Strategy RPG, Turn-Based Tactics
69% of 91 reviews positive

9·Heroes of Steel RPG
76% match · Strategy RPG, Turn-Based Tactics
78% of 286 reviews positive

10·Forrader Hero
76% match · Grid-Based Movement, Turn-Based Combat
89% of 83 reviews positive

11·StarCrawlers
76% match · Grid-Based Movement, Dungeon Crawler
84% of 899 reviews positive

12·Overfall
75% match · Strategy RPG, Dungeon Crawler
47% of 881 reviews positive

13·Void Bastards
74% match · Comic Book, Rogue-like
86% of 5,436 reviews positive · 14 playing

14·Dungeon Rushers
74% match · Dungeon Crawler, Turn-Based Tactics
62% of 1,235 reviews positive

15·Magicians' Legacy: Prologue
74% match · Grid-Based Movement, Turn-Based Tactics
90% of 49 reviews positive

16·App 1627330
74% match · Comic Book, Turn-Based Tactics
94% of 35 reviews positive

17·Shardpunk
74% match · Grid-Based Movement, Turn-Based Tactics
93% of 784 reviews positive

18·Legend of Grimrock 2
74% match · Grid-Based Movement, Dungeon Crawler
91% of 4,087 reviews positive

19·Whispers of the Eyeless
74% match · Strategy RPG, Turn-Based Tactics
77% of 269 reviews positive

20·Zavix Tower
74% match · Grid-Based Movement, Dungeon Crawler
73% of 344 reviews positive

21·La Pucelle: Ragnarok
74% match · Grid-Based Movement, Strategy RPG
89% of 102 reviews positive

22·King Arthur: Knight's Tale
73% match · Grid-Based Movement, Turn-Based Tactics
84% of 7,567 reviews positive

23·Prime of Flames
73% match · Strategy RPG, Turn-Based Tactics
85% of 1,024 reviews positive

24·Dwarves & Dungeons
73% match · Strategy RPG, Dungeon Crawler
65% of 72 reviews positive
The closest matches to Space Prison on Steam are Craft Hero, Mercenaries Blaze, The Dragoness: Command of the Flame, Lost Eidolons: Veil of the Witch, Mortal Glory 2. They rank highest because their Steam community tags overlap most with Space Prison's, and shared tags include Strategy RPG, Crafting, Dungeon Crawler.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Strategy RPG, Crafting, Dungeon Crawler 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 Prison's. Popularity never affects the ranking.