24 games ranked by how much the tags Steam players vote on them overlap with Chamber of Darkness'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: Platformer, Difficult, Great Soundtrack, Pixel Graphics, Violent, 2D.

1·Electronic Super Joy: Groove City
82% match · Platformer, Difficult
81% of 569 reviews positive

2·Rocketbirds 2 Evolution
81% match · Platformer, Violent
76% of 411 reviews positive

3·Angry Video Game Nerd II: ASSimilation
81% match · Platformer, Violent
89% of 795 reviews positive

4·FEIST
81% match · Platformer, Difficult
74% of 543 reviews positive

5·OVERWHELM
81% match · Platformer, Pixel Graphics
85% of 240 reviews positive

6·Element4l
80% match · Platformer, Great Soundtrack
83% of 657 reviews positive

7·BUTCHER
80% match · Violent, Platformer
86% of 1,421 reviews positive

8·Shovel Knight: Treasure Trove
80% match · Platformer, Pixel Graphics
95% of 16,958 reviews positive

9·Mastema: Out of Hell
79% match · Violent, Platformer
62% of 157 reviews positive

10·Mago
79% match · Platformer, Pixel Graphics
93% of 1,058 reviews positive

11·Valfaris
78% match · Platformer, Violent
82% of 2,862 reviews positive

12·The Deer God
78% match · Platformer, Pixel Graphics
65% of 476 reviews positive

13·Atomik: RunGunJumpGun
77% match · Platformer, Difficult
85% of 326 reviews positive

14·SUPER DISTRO
77% match · Platformer, Difficult
38% of 1,160 reviews positive

15·Super Life of Pixel
77% match · Platformer, Pixel Graphics
78% of 377 reviews positive

16·AtmaSphere
77% match · Medieval, Platformer
80% of 2,070 reviews positive

17·Vox Populi Vox Dei 2
77% match · Platformer, Pixel Graphics
86% of 498 reviews positive

18·Eron
77% match · Platformer, Pixel Graphics
60% of 358 reviews positive

19·A Walk in the Dark
77% match · Platformer, Difficult
80% of 389 reviews positive

20·Expelled
77% match · Platformer, Great Soundtrack
58% of 106 reviews positive

21·NightmareZ
77% match · Platformer, Difficult
47% of 62 reviews positive

22·Reset 1-1
77% match · Platformer, Pixel Graphics
65% of 274 reviews positive

23·Bob Was Hungry
76% match · Platformer, Difficult
88% of 623 reviews positive

24·MO:Astray
76% match · Platformer, Pixel Graphics
92% of 5,068 reviews positive
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The closest matches to Chamber of Darkness on Steam are Electronic Super Joy: Groove City, Rocketbirds 2 Evolution, Angry Video Game Nerd II: ASSimilation, FEIST, OVERWHELM. They rank highest because their Steam community tags overlap most with Chamber of Darkness's, and shared tags include Platformer, Difficult, Great Soundtrack.
Every game is described by the tags Steam players vote on it. Rare, specific tags such as Platformer, Difficult, Great Soundtrack count far more than catch-all ones like "Indie" or "Singleplayer", and each game is scored on how closely its whole tag profile matches Chamber of Darkness's. Popularity never affects the ranking.