Games like Bucket Knight
Games like Bucket Knight include Celeste, Rogue Legacy 2, Super Meat Boy, Downwell, and Rogue Legacy. We matched them by the tags players give Bucket Knight on Steam (Precision Platformer, 2D Platformer, Puzzle Platformer, Roguelite, and Platformer): closest matches first, and among equally close ones the better-known games.

Celeste
Shared: Precision Platformer · 2D Platformer · Platformer

Rogue Legacy 2
Shared: Platformer · Arcade · Roguelite

Super Meat Boy
Shared: Precision Platformer · 2D Platformer · Platformer

Downwell
Shared: Precision Platformer · 2D Platformer · Platformer

Rogue Legacy
Shared: Platformer · Roguelike · Action

Vampire Survivors
Shared: Roguelite · 2D · Roguelike

Pizza Tower
Shared: 2D Platformer · Platformer · Indie

Dead Cells
Shared: Roguelite · Roguelike · Adventure

Skul: The Hero Slayer
Shared: Roguelite · Action · Platformer

Trine 5: A Clockwork Conspiracy
Shared: Platformer · Puzzle Platformer · RPG

VVVVVV
Shared: Precision Platformer · 2D Platformer · Platformer

SANABI
Shared: 2D Platformer · Action · Platformer

Webbed
Shared: 2D Platformer · Puzzle Platformer · Platformer

Broforce
Shared: Platformer · Action · Shooter

Songs for a Hero - Definitive Edition
Shared: 2D Platformer · Platformer · Puzzle Platformer

Leap Year
Shared: Precision Platformer · 2D Platformer · Puzzle Platformer

Gunfire Reborn
Shared: Roguelite · Roguelike · RPG

Streets of Rogue
Shared: Roguelite · RPG · Action

Neon Abyss
Shared: Platformer · Roguelike · Shooter

Antonball Deluxe
Shared: 2D Platformer · Puzzle Platformer · Platformer

Dungreed
Shared: Roguelite · Roguelike · Action

Jump King
Shared: Precision Platformer · Platformer · Adventure

Geometry Dash
Shared: Precision Platformer · Platformer · 2D

Halls of Torment
Shared: Roguelite · RPG · Roguelike