Games like Ascendant
Games like Ascendant include Skul: The Hero Slayer, Rogue Legacy, Vampire Survivors, Rogue Legacy 2, and Hades. We matched them by the tags players give Ascendant on Steam (Platformer, Action, Indie, Beat 'em up, and Action Roguelike): closest matches first, and among equally close ones the better-known games.

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

Rogue Legacy
Shared: Platformer · Indie · Action

Vampire Survivors
Shared: Action Roguelike · Roguelite · Indie

Rogue Legacy 2
Shared: Platformer · Action · Indie

Hades
Shared: Action Roguelike · Indie · Action

Dead Cells
Shared: Adventure · Action Roguelike · Roguelite

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

Spelunky
Shared: Platformer · Indie · Action Roguelike

Dust: An Elysian Tail
Shared: Platformer · Action · Indie

Dungreed
Shared: Action Roguelike · Action · Indie

Streets of Rogue
Shared: Action Roguelike · Roguelite · Action

Hades II
Shared: Action · Roguelite · Action Roguelike

Megabonk
Shared: Action Roguelike · Indie · Roguelite

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

Gunfire Reborn
Shared: Roguelite · Indie · Action

ScourgeBringer
Shared: Action · Indie · Roguelite

Brotato
Shared: Action Roguelike · Roguelike · Local Co-Op

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

UnderMine
Shared: Action Roguelike · Roguelite · Indie

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Magicite
Shared: Indie · RPG · Platformer

Juicy Realm
Shared: Action · Indie · Action Roguelike

Rampage Knights
Shared: Action · Action Roguelike · Beat 'em up

Wizard of Legend
Shared: Action Roguelike · Action · Roguelike