Games like Skillbound
Games like Skillbound include Vampire Survivors, Rogue Legacy, Skul: The Hero Slayer, Rogue Legacy 2, and Risk of Rain (2013). We matched them by the tags players give Skillbound on Steam (Action, Casual, RPG, Arcade, and Platformer): closest matches first, and among equally close ones the better-known games.

Vampire Survivors
Shared: Action Roguelike · Casual · Action

Rogue Legacy
Shared: Action · Platformer · Roguelike

Skul: The Hero Slayer
Shared: Action · Action Roguelike · Roguelike

Rogue Legacy 2
Shared: Action · Arcade · Platformer

Risk of Rain (2013)
Shared: Action · Roguelike · Action Roguelike

Death Must Die
Shared: RPG · Action Roguelike · Action

Halls of Torment
Shared: Action Roguelike · Action · Roguelike

Hades II
Shared: Action · Roguelike · RPG

Dungreed
Shared: Action · Action Roguelike · Roguelike

Hades
Shared: Action · Action Roguelike · Roguelike

Megabonk
Shared: Roguelike · Action Roguelike · Action

Spelunky
Shared: Platformer · Roguelike · Action Roguelike

Broforce
Shared: Action · Platformer · 2D

Dead Cells
Shared: Roguelike · Action Roguelike · 2D

Downwell
Shared: Action · Platformer · Arcade

Crab Champions
Shared: Action Roguelike · Arcade · Roguelike

BALL x PIT
Shared: Action · Arcade · Roguelike

Magicite
Shared: RPG · Roguelike · Action Roguelike

UFO 50
Shared: Action · Arcade · RPG

The Binding of Isaac: Rebirth
Shared: Roguelike · Action Roguelike · Indie

Juicy Realm
Shared: Action · RPG · Casual

BlazBlue Entropy Effect
Shared: Action · Action Roguelike · Platformer

Roguelands
Shared: RPG · Roguelike · Action Roguelike

Hero Siege
Shared: RPG · Action Roguelike · Action