Games like Jade Guardian
Games like Jade Guardian include Rogue Legacy 2, Cyberhunt, ICEY, To The Core, and Vampire Survivors. We matched them by the tags players give Jade Guardian on Steam (Casual, Adventure, Arcade, Side Scroller, and 2D): closest matches first, and among equally close ones the better-known games.

Rogue Legacy 2
Shared: Arcade · Adventure · Action

Cyberhunt
Shared: Casual · Adventure · Arcade

ICEY
Shared: Adventure · Side Scroller · Action

To The Core
Shared: Casual · Arcade · 2D

Vampire Survivors
Shared: 2D · Casual · Arcade

Streets of Rage 4
Shared: 2D · Arcade · Action

Timberman
Shared: Casual · 2D · Arcade

Kung Fury: Street Rage - Ultimate Edition
Shared: Arcade · Side Scroller · Action

Strange Jigsaws
Shared: Casual · Adventure · 2D

SANABI
Shared: Adventure · Action · 2D

Bladed fury
Shared: Adventure · Action · Casual

Super Fancy Pants Adventure
Shared: Adventure · Casual · Action

BEEP
Shared: Adventure · 2D · Indie

pureya
Shared: Casual · Arcade · 2D

A Dance of Fire and Ice
Shared: Arcade · 2D · Casual

Skul: The Hero Slayer
Shared: Action · 2D · Indie

Exit the Gungeon
Shared: Arcade · Adventure · Action

Pikuniku
Shared: Adventure · Casual · Indie

UFO 50
Shared: Arcade · 2D · Indie

That's not my Neighbor
Shared: Casual · Adventure · Arcade

Melvor Idle
Shared: Casual · Adventure · 2D

Mark of the Ninja
Shared: 2D · Adventure · Side Scroller

The Vagrant
Shared: 2D · Adventure · Side Scroller

Broforce
Shared: 2D · Action · Side Scroller