Games like Wormswarm
Games like Wormswarm include Super Hexagon, Super Meat Boy, Geometry Dash, Downwell, and Celeste. We matched them by the tags players give Wormswarm on Steam (Experimental, Casual, Precision Platformer, Score Attack, and Fast-Paced): closest matches first, and among equally close ones the better-known games.

Super Hexagon
Shared: Difficult · Fast-Paced · Arcade

Super Meat Boy
Shared: Precision Platformer · Difficult · Fast-Paced

Geometry Dash
Shared: Difficult · Precision Platformer · Singleplayer

Downwell
Shared: Precision Platformer · Arcade · Difficult

Celeste
Shared: Precision Platformer · Difficult · Singleplayer

Clustertruck
Shared: Parkour · Fast-Paced · First-Person

Timberman
Shared: Casual · Arcade · Difficult

PAC-MAN™ Championship Edition DX+
Shared: Arcade · Score Attack · Retro

ULTRAKILL
Shared: Fast-Paced · Difficult · Retro

AudioSurf
Shared: Casual · Arcade · Score Attack

A Dance of Fire and Ice
Shared: Difficult · Arcade · Singleplayer

Post Void
Shared: Fast-Paced · Difficult · Singleplayer

oO
Shared: Precision Platformer · Difficult · Arcade

VHOLUME
Shared: Casual · Parkour · Arcade

Neon White
Shared: Fast-Paced · Parkour · Precision Platformer

Orbt XL
Shared: Difficult · Arcade · Casual

PAC-MAN™ CHAMPIONSHIP EDITION 2
Shared: Casual · Arcade · Score Attack

Getting Over It with Bennett Foddy
Shared: Difficult · Singleplayer · Casual

SEUM: Speedrunners from Hell
Shared: Precision Platformer · Parkour · Difficult

Cyber Hook
Shared: Fast-Paced · Parkour · Retro

Planes, Bullets and Vodka
Shared: Casual · Retro · Arcade

Haste
Shared: Fast-Paced · Parkour · Singleplayer

Trip to Vinelands
Shared: Fast-Paced · Arcade · Casual

Jump King
Shared: Precision Platformer · Difficult · Retro