24 games ranked by how much the tags Steam players vote on them overlap with Fallen: A2P Protocol'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: Post-apocalyptic, Turn-Based, CRPG, Kickstarter, Isometric, Tactical.

1·Wasteland 2: Director's Cut
96% match · Post-apocalyptic, Turn-Based
83% of 8,108 reviews positive

2·Fallout Tactics: Brotherhood of Steel
92% match · Post-apocalyptic, Turn-Based
79% of 2,955 reviews positive

3·The Banner Saga
90% match · Turn-Based, Turn-Based Strategy
89% of 15,976 reviews positive

4·Blackguards 2
89% match · Turn-Based, Turn-Based Combat
67% of 1,316 reviews positive · 5 playing

5·Mutant Year Zero: Road to Eden
89% match · Post-apocalyptic, Turn-Based Tactics
90% of 20,585 reviews positive

6·Fell Seal: Arbiter's Mark
89% match · Turn-Based Tactics, Tactical RPG
88% of 6,368 reviews positive

7·Jagged Alliance 3
88% match · Turn-Based Tactics, Turn-Based Strategy
88% of 15,109 reviews positive

8·The Banner Saga 3
87% match · Turn-Based Tactics, Turn-Based
78% of 3,111 reviews positive

9·Expeditions: Conquistador
87% match · Turn-Based, Turn-Based Strategy
79% of 1,626 reviews positive

10·Blackguards
87% match · Turn-Based, Tactical
62% of 3,922 reviews positive

11·MASSIVE CHALICE
86% match · Turn-Based Tactics, Turn-Based
73% of 1,912 reviews positive

12·Jagged Alliance Flashback
86% match · Turn-Based, Tactical
47% of 777 reviews positive

13·The Age of Decadence
86% match · CRPG, Turn-Based Tactics
82% of 4,067 reviews positive

14·Encased: A Sci-Fi Post-Apocalyptic RPG
86% match · CRPG, Post-apocalyptic
77% of 4,822 reviews positive

15·Clatter
86% match · Turn-Based, Turn-Based Tactics
83% of 1,270 reviews positive

16·Tactical Breach Wizards
85% match · Turn-Based Tactics, Turn-Based
98% of 12,220 reviews positive

17·Divinity: Original Sin (Classic)
85% match · Turn-Based, RPG
92% of 11,916 reviews positive

18·Stellar Tactics
85% match · CRPG, Tactical RPG
78% of 1,754 reviews positive

19·UnderRail
85% match · Post-apocalyptic, CRPG
86% of 7,266 reviews positive

20·The Last Spell
85% match · Turn-Based Tactics, Turn-Based
91% of 13,771 reviews positive

21·Skyshine's BEDLAM
85% match · Turn-Based, Post-apocalyptic
59% of 879 reviews positive

22·Lost Eidolons
85% match · Crowdfunded, Kickstarter
68% of 2,410 reviews positive

23·Urban Strife
84% match · Post-apocalyptic, Turn-Based
70% of 700 reviews positive

24·Cyber Knights: Flashpoint
83% match · Turn-Based Tactics, Turn-Based Combat
94% of 3,248 reviews positive
The closest matches to Fallen: A2P Protocol on Steam are Wasteland 2: Director's Cut, Fallout Tactics: Brotherhood of Steel, The Banner Saga, Blackguards 2, Mutant Year Zero: Road to Eden. They rank highest because their Steam community tags overlap most with Fallen: A2P Protocol's, and shared tags include Post-apocalyptic, Turn-Based, CRPG.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Post-apocalyptic, Turn-Based, CRPG count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Fallen: A2P Protocol's. Popularity never affects the ranking.