Games like 30XX
Games like 30XX include Skul: The Hero Slayer, Anomaly Agent, Dead Cells, Vampire Survivors, and 20XX. We matched them by the tags players give 30XX on Steam (Action Roguelike, 2D Platformer, Side Scroller, Roguelite, and Platformer): closest matches first, and among equally close ones the better-known games.
Skul: The Hero Slayer
Shared: Action Roguelike · Roguelite · Roguelike
Anomaly Agent
Shared: 2D Platformer · Action Roguelike · Side Scroller
Dead Cells
Shared: Action Roguelike · Roguelike · Roguelite
Vampire Survivors
Shared: Action Roguelike · Roguelite · 2D
20XX
Shared: Action Roguelike · 2D Platformer · Platformer
Rogue Legacy
Shared: Action Roguelike · Platformer · Roguelike
Caveblazers
Shared: Action Roguelike · Platformer · Roguelite
Risk of Rain (2013)
Shared: Action Roguelike · Platformer · Roguelike
Dungreed
Shared: Action Roguelike · Roguelite · Roguelike
The Binding of Isaac: Rebirth
Shared: Action Roguelike · Roguelike · Pixel Graphics
Noita
Shared: Roguelike · Action Roguelike · Pixel Graphics
Spelunky
Shared: Action Roguelike · Platformer · Roguelike
Spelunky 2
Shared: 2D Platformer · Platformer · Perma Death
Blade Assault
Shared: 2D Platformer · Platformer · Roguelike
Hades
Shared: Action Roguelike · Roguelite · Roguelike
Streets of Rogue
Shared: Action Roguelike · Roguelite · Roguelike
Hades II
Shared: Roguelite · Action Roguelike · Roguelike
ScourgeBringer
Shared: Action Roguelike · Roguelite · Roguelike
Momodora: Reverie Under The Moonlight
Shared: 2D Platformer · Side Scroller · Female Protagonist
Roguelands
Shared: Action Roguelike · Roguelike · 2D
BlazBlue Entropy Effect
Shared: Action Roguelike · Platformer · 2D
Death Must Die
Shared: Action Roguelike · Roguelite · Pixel Graphics
Spiritfall
Shared: Action Roguelike · 2D Platformer · Roguelite
Celeste
Shared: 2D Platformer · Platformer · Pixel Graphics