24 games ranked by how much the tags Steam players vote on them overlap with Insurmountable'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: Replay Value, Tactical, Rogue-like, Survival, Perma Death, Resource Management.

1·Space Rogue
78% match · Replay Value, Tactical
64% of 453 reviews positive

2·Unalive
74% match · Perma Death, Rogue-like
72% of 384 reviews positive

3·Shortest Trip to Earth
74% match · Resource Management, Rogue-lite
77% of 1,436 reviews positive

4·FTL: Faster Than Light
74% match · Rogue-like, Perma Death
95% of 78,898 reviews positive · 922 playing

5·Heads Will Roll: Reforged
74% match · Perma Death, Text-Based
83% of 1,735 reviews positive

6·Dungeon of the ENDLESS™
73% match · Rogue-like, Perma Death
85% of 14,062 reviews positive

7·Despotism 3k
73% match · Perma Death, Replay Value
77% of 3,839 reviews positive

8·A Legionary's Life
73% match · Text-Based, Perma Death
87% of 2,501 reviews positive

9·Invisible, Inc.
73% match · Perma Death, Turn-Based Tactics
91% of 5,793 reviews positive

10·Warsim: The Realm of Aslona
73% match · Text-Based, Rogue-like
96% of 2,224 reviews positive

11·Trigon: Space Story
72% match · Perma Death, Resource Management
68% of 1,424 reviews positive

12·Crown Trick
72% match · Perma Death, Rogue-like
85% of 5,397 reviews positive

13·Shelter
72% match · Nature, Perma Death
85% of 3,716 reviews positive

14·Scrapyard Simulator
72% match · Resource Management, Management
47% of 459 reviews positive

15·Mortal Glory
72% match · Turn-Based Tactics, Rogue-like
87% of 582 reviews positive

16·Crowntakers
72% match · Perma Death, Rogue-like
73% of 689 reviews positive

17·Killing Room
72% match · Perma Death, Rogue-like
69% of 1,451 reviews positive

18·Dead In Vinland
71% match · Perma Death, Resource Management
77% of 1,838 reviews positive

19·MASSIVE CHALICE
71% match · Turn-Based Tactics, Tactical
73% of 1,912 reviews positive

20·Steam Marines
71% match · Rogue-like, Perma Death
50% of 333 reviews positive

21·The Dungeon Beneath
71% match · Perma Death, Turn-Based Tactics
89% of 898 reviews positive · 3 playing

22·Aquamarine: Explorer's Edition
71% match · Nature, Resource Management
68% of 68 reviews positive

23·AI Roguelite
71% match · Text-Based, Perma Death
83% of 632 reviews positive

24·Dandy Ace
71% match · Perma Death, Rogue-like
87% of 1,323 reviews positive
The closest matches to Insurmountable on Steam are Space Rogue, Unalive, Shortest Trip to Earth, FTL: Faster Than Light, Heads Will Roll: Reforged. They rank highest because their Steam community tags overlap most with Insurmountable's, and shared tags include Replay Value, Tactical, Rogue-like.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Replay Value, Tactical, Rogue-like count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Insurmountable's. Popularity never affects the ranking.