Games like Usagi's Dreamy Day Off
Games like Usagi's Dreamy Day Off include Skul: The Hero Slayer, Hades, Rogue Legacy, Vampire Survivors, and Rogue Legacy 2. We matched them by the tags players give Usagi's Dreamy Day Off on Steam (Action, Action Roguelike, Arcade, Platformer, and Roguelite): closest matches first, and among equally close ones the better-known games.

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

Hades
Shared: Action Roguelike · Roguelite · Action

Rogue Legacy
Shared: Platformer · Action Roguelike · Action

Vampire Survivors
Shared: Action Roguelike · Roguelite · Action

Rogue Legacy 2
Shared: Arcade · Action · Platformer

Megabonk
Shared: Action Roguelike · Roguelite · Action

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

BALL x PIT
Shared: Action · Arcade · Roguelite

Spelunky
Shared: Action Roguelike · Platformer · Arcade

Cult of the Lamb
Shared: Action Roguelike · Cute · Roguelite

Halls of Torment
Shared: Action Roguelike · Roguelite · Action

Hades II
Shared: Action · Roguelite · Action Roguelike

Sephiria
Shared: Action Roguelike · Roguelite · Action

Shape of Dreams
Shared: Action Roguelike · Action · Roguelite

Dungreed
Shared: Action Roguelike · Action · Roguelite

BlazBlue Entropy Effect
Shared: Action Roguelike · Action · Platformer

20XX
Shared: Action Roguelike · Action · Platformer

UnderMine
Shared: Action Roguelike · Roguelite · Action

Downwell
Shared: Action Roguelike · Platformer · Arcade

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

Deep Rock Galactic: Survivor
Shared: Action Roguelike · Roguelite · Action

Nova Drift
Shared: Arcade · Action Roguelike · Roguelite

Risk of Rain 2
Shared: Action Roguelike · Action · Roguelite

Windowkill
Shared: Action · Action Roguelike · Arcade