Games like Koboo: The Tree Spirit
Games like Koboo: The Tree Spirit include Hades, Dead Cells, Hades II, Anomaly Agent, and Skul: The Hero Slayer. We matched them by the tags players give Koboo: The Tree Spirit on Steam (Action Roguelike, Hack and Slash, Fishing, Souls-like, and 2D Platformer): closest matches first, and among equally close ones the better-known games.

Hades
Shared: Action Roguelike · Hack and Slash · Roguelite

Dead Cells
Shared: Action Roguelike · Hack and Slash · Souls-like

Hades II
Shared: Hack and Slash · Action Roguelike · Roguelite

Anomaly Agent
Shared: Action Roguelike · Hack and Slash · 2D Platformer

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

Halls of Torment
Shared: Action Roguelike · Roguelite · Hack and Slash

Death Must Die
Shared: Action Roguelike · Roguelite · Hack and Slash

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

Hero Siege
Shared: Hack and Slash · Action Roguelike · Action RPG

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

Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D

Caveblazers
Shared: Action Roguelike · Roguelite · 2D Platformer

Noita
Shared: Difficult · Action Roguelike · Roguelike

Spiritfall
Shared: Action Roguelike · Hack and Slash · 2D Platformer

Moonlighter
Shared: Hack and Slash · Action Roguelike · Roguelite

Dungreed
Shared: Action Roguelike · Roguelite · Roguelike

Soulstone Survivors
Shared: Action Roguelike · Roguelite · Hack and Slash

Dragon Is Dead
Shared: Action Roguelike · Hack and Slash · Roguelite

Astral Ascent
Shared: Action Roguelike · Hack and Slash · Roguelite

Windblown
Shared: Action Roguelike · Hack and Slash · Roguelite

Blasphemous 2
Shared: Souls-like · Difficult · Hack and Slash

Rogue Legacy
Shared: Action Roguelike · Platformer · Roguelike

Black Myth: Wukong
Shared: Souls-like · Action RPG · Action

VOIN
Shared: Hack and Slash · Action Roguelike · Souls-like