24 games ranked by how much the tags Steam players vote on them overlap with Battle Brawlers'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: Tower Defense, Free to Play, Competitive, PvP, Real Time Tactics, Strategy.

1·Bloons TD Battles
95% match · Tower Defense, Free to Play
91% of 29,324 reviews positive

2·Prime World: Defenders 2
90% match · Tower Defense, Free to Play
79% of 2,192 reviews positive

3·Tiny Toyfare
89% match · Tower Defense, Free to Play
76% of 45 reviews positive

4·Fire With Fire Tower Attack and Defense
88% match · Tower Defense, Free to Play
47% of 233 reviews positive

5·The Defender: Farm and Castle
87% match · Tower Defense, Free to Play
89% of 1,096 reviews positive

6·Element TD 2 - Tower Defense
86% match · Real Time Tactics, Tower Defense
90% of 3,235 reviews positive

7·METAL SLUG DEFENSE
85% match · Free to Play, Tower Defense
57% of 2,241 reviews positive

8·Arcane Showdown - Battle Arena
85% match · Free to Play, Real Time Tactics
72% of 367 reviews positive

9·Rise of Legions
85% match · Tower Defense, Free to Play
82% of 1,620 reviews positive

10·Spartans Vs Zombies Defense
84% match · Free to Play, Tower Defense
47% of 753 reviews positive

11·One Troll Army
83% match · Tower Defense, Strategy
86% of 1,497 reviews positive

12·Orcs Must Die! Unchained
83% match · Tower Defense, Free to Play
69% of 6,105 reviews positive

13·RaidLand
83% match · Competitive, Free to Play
86% of 721 reviews positive

14·HoloParade
82% match · Tower Defense, Real Time Tactics
85% of 1,156 reviews positive

15·Bloons Monkey City
82% match · Tower Defense, Free to Play
91% of 6,806 reviews positive

16·Bloons Adventure Time TD
81% match · Tower Defense, Free to Play
87% of 4,808 reviews positive

17·GUNS UP!
81% match · Tower Defense, Free to Play
75% of 6,680 reviews positive

18·Cubemen 2
80% match · Tower Defense, Strategy
68% of 227 reviews positive

19·Commando Jack
80% match · Tower Defense, Strategy
50% of 563 reviews positive

20·Slizer Battle Management System
80% match · Free to Play, Real Time Tactics
82% of 74 reviews positive

21·Abyss Raiders: Uncharted
80% match · Tower Defense, Strategy
42% of 179 reviews positive

22·War in a Box: Paper Tanks
80% match · Tower Defense, Strategy
71% of 209 reviews positive

23·Shad'O
80% match · Tower Defense, Strategy
54% of 127 reviews positive

24·iBomber Defense
80% match · Tower Defense, Strategy
73% of 248 reviews positive
The closest matches to Battle Brawlers on Steam are Bloons TD Battles, Prime World: Defenders 2, Tiny Toyfare, Fire With Fire Tower Attack and Defense, The Defender: Farm and Castle. They rank highest because their Steam community tags overlap most with Battle Brawlers's, and shared tags include Tower Defense, Free to Play, Competitive.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Tower Defense, Free to Play, Competitive count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Battle Brawlers's. Popularity never affects the ranking.