24 games ranked by how much the tags Steam players vote on them overlap with Stellar Initiative'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, Mechs, Base-Building, Pixel Graphics, Rogue-like, Procedural Generation.

1·Mechs V Kaijus - Tower Defense
91% match · Tower Defense, Mechs
84% of 541 reviews positive

2·Rogue Tower
88% match · Tower Defense, Rogue-like
83% of 5,932 reviews positive

3·Revenge of the Titans
88% match · Tower Defense, Aliens
82% of 1,258 reviews positive

4·Wall World
87% match · Tower Defense, Mechs
91% of 12,755 reviews positive

5·Dungeon of the ENDLESS™
86% match · Tower Defense, Rogue-like
85% of 14,062 reviews positive

6·Unstoppable Gorg
86% match · Tower Defense, Aliens
79% of 307 reviews positive

7·Iron Brigade
86% match · Tower Defense, Mechs
86% of 1,248 reviews positive

8·Protolife
86% match · Tower Defense, Base-Building
86% of 470 reviews positive

9·Super Sanctum TD
85% match · Tower Defense, Aliens
86% of 1,582 reviews positive

10·Defense Grid: The Awakening
85% match · Tower Defense, Sci-fi
96% of 5,380 reviews positive

11·DG2: Defense Grid 2
84% match · Tower Defense, Strategy
87% of 3,467 reviews positive

12·Space Run
84% match · Tower Defense, Space
85% of 2,152 reviews positive

13·Space Run Galaxy
84% match · Tower Defense, Strategy
64% of 1,035 reviews positive

14·Harvest: Massive Encounter
84% match · Tower Defense, Strategy
79% of 164 reviews positive

15·Dungeon Warfare 2
83% match · Tower Defense, Strategy
90% of 1,161 reviews positive

16·REDCON
83% match · Tower Defense, Base-Building
86% of 852 reviews positive

17·Sentinel 3: Homeworld
83% match · Tower Defense, Strategy
80% of 149 reviews positive

18·Anomaly Defenders
83% match · Tower Defense, Strategy
78% of 689 reviews positive

19·Sol Survivor
83% match · Tower Defense, Strategy
90% of 441 reviews positive

20·Anomaly: Warzone Earth
82% match · Tower Defense, Strategy
87% of 4,693 reviews positive

21·Creeper World 3: Arc Eternal
82% match · Tower Defense, Base-Building
96% of 4,833 reviews positive

22·GemCraft - Chasing Shadows
82% match · Tower Defense, Strategy
95% of 4,415 reviews positive

23·Mineral Defense
82% match · Tower Defense, Rogue-like
91% of 253 reviews positive

24·The Riftbreaker
82% match · Tower Defense, Base-Building
90% of 25,004 reviews positive
The closest matches to Stellar Initiative on Steam are Mechs V Kaijus - Tower Defense, Rogue Tower, Revenge of the Titans, Wall World, Dungeon of the ENDLESS™. They rank highest because their Steam community tags overlap most with Stellar Initiative's, and shared tags include Tower Defense, Mechs, Base-Building.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Tower Defense, Mechs, Base-Building count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Stellar Initiative's. Popularity never affects the ranking.