Games like Trigonometry
Games like Trigonometry include A Dance of Fire and Ice, Timberman, Super Hexagon, Hollow Knight: Silksong, and Hollow Knight. We matched them by the tags players give Trigonometry on Steam (Indie, Casual, Action, Singleplayer, and 2D): closest matches first, and among equally close ones the better-known games.

A Dance of Fire and Ice
Shared: Indie · Singleplayer · 2D

Timberman
Shared: Casual · Indie · Action

Super Hexagon
Shared: Indie · Difficult · Arcade

Hollow Knight: Silksong
Shared: Indie · 2D · Singleplayer

Hollow Knight
Shared: Indie · 2D · Singleplayer

Vampire Survivors
Shared: Indie · 2D · Singleplayer

Zup! S
Shared: Casual · Indie · 2D

Minimalism
Shared: Indie · Casual · Action

One Finger Death Punch
Shared: Action · Indie · Singleplayer

Geometry Dash
Shared: 2D · Difficult · Singleplayer

WAVESHAPER
Shared: Casual · Indie · Action

Skul: The Hero Slayer
Shared: Indie · Action · 2D

Superflight
Shared: Indie · Casual · Singleplayer

Zuma's Revenge!
Shared: Casual · Action · Singleplayer

Marble Mayhem: Fragile Ball
Shared: Indie · Casual · Singleplayer

LIMBO
Shared: Indie · 2D · Singleplayer

One Finger Death Punch 2
Shared: Indie · Action · Casual

Baba Is You
Shared: Indie · Singleplayer · Difficult

Rogue Legacy 2
Shared: Indie · Action · Arcade

Waveform
Shared: Indie · Casual · Singleplayer

Exit the Gungeon
Shared: Indie · Action · Arcade

DJMAX RESPECT V
Shared: Casual · Action · Singleplayer

Orbt XL
Shared: Arcade · 2D · Action

Defy Gravity Extended
Shared: Indie · 2D · Singleplayer