24 games ranked by how much the tags Steam players vote on them overlap with Project RTD: Random Tower Defense PvP'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, Strategy, Tactical, Simulation, PvP, Futuristic.

1·Commando Jack
88% match · Tower Defense, Strategy
50% of 563 reviews positive

2·Rise of the Ancients
87% match · Strategy, Tower Defense
43% of 350 reviews positive

3·Anomaly Warzone Earth Mobile Campaign
86% match · Tower Defense, Strategy
79% of 557 reviews positive

4·Dungeon Warfare 2
86% match · Tower Defense, Strategy
90% of 1,159 reviews positive

5·Particula
86% match · Tower Defense, Strategy
70% of 2,804 reviews positive

6·Anomaly Korea
86% match · Tower Defense, Strategy
79% of 801 reviews positive

7·Island Defense
85% match · Tower Defense, Strategy
53% of 122 reviews positive

8·Anomaly Defenders
85% match · Tower Defense, Strategy
78% of 689 reviews positive

9·Anomaly 2
85% match · Tower Defense, Strategy
79% of 1,070 reviews positive

10·Shad'O
85% match · Tower Defense, Strategy
54% of 127 reviews positive

11·Garden Rescue
85% match · Tower Defense, Strategy
75% of 153 reviews positive

12·Cubemen
84% match · Tower Defense, Strategy
71% of 511 reviews positive

13·DG2: Defense Grid 2
84% match · Tower Defense, Strategy
87% of 3,464 reviews positive · 51 playing

14·One Troll Army
84% match · Strategy, Tower Defense
86% of 1,495 reviews positive

15·GemCraft - Chasing Shadows
83% match · Tower Defense, Strategy
95% of 4,413 reviews positive

16·Evil Defenders
83% match · Tower Defense, Strategy
82% of 406 reviews positive

17·Toy Soldiers: Complete
83% match · Tower Defense, Strategy
78% of 1,185 reviews positive

18·Space Run Galaxy
83% match · Tower Defense, Strategy
64% of 1,035 reviews positive

19·Warstone TD
83% match · Tower Defense, Strategy
82% of 3,891 reviews positive

20·Age of Steel: Recharge
83% match · Tower Defense, Strategy
69% of 259 reviews positive

21·Cubetractor
83% match · Strategy, Tower Defense
74% of 481 reviews positive

22·Fieldrunners
82% match · Tower Defense, Strategy
67% of 349 reviews positive

23·Terrorhedron Tower Defense
82% match · Tower Defense, Strategy
84% of 1,176 reviews positive

24·Defense Grid: The Awakening
82% match · Tower Defense, Strategy
96% of 5,375 reviews positive · 49 playing
The closest matches to Project RTD: Random Tower Defense PvP on Steam are Commando Jack, Rise of the Ancients, Anomaly Warzone Earth Mobile Campaign, Dungeon Warfare 2, Particula. They rank highest because their Steam community tags overlap most with Project RTD: Random Tower Defense PvP's, and shared tags include Tower Defense, Strategy.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Tower Defense, Strategy, Tactical count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Project RTD: Random Tower Defense PvP's. Popularity never affects the ranking.