Games like Xion Leak
Games like Xion Leak include BattleBlock Theater®, Broforce, It Takes Two, PICO PARK, and Castle Crashers®. We matched them by the tags players give Xion Leak on Steam (Local Multiplayer, Multiplayer, Online Co-Op, Local Co-Op, and Racing): closest matches first, and among equally close ones the better-known games.

BattleBlock Theater®
Shared: Co-op · Multiplayer · Platformer

Broforce
Shared: Co-op · Local Co-Op · Multiplayer

It Takes Two
Shared: Multiplayer · Co-op · Local Co-Op

PICO PARK
Shared: Multiplayer · Online Co-Op · Co-op

Castle Crashers®
Shared: Online Co-Op · Co-op · 2D

Brawlhalla
Shared: Multiplayer · Local Multiplayer · 2D Platformer

Overcooked! 2
Shared: Multiplayer · Online Co-Op · Local Co-Op

Rocket League®
Shared: Multiplayer · Online Co-Op · Racing

Ultimate Chicken Horse
Shared: Multiplayer · Local Co-Op · Local Multiplayer

Move or Die
Shared: Multiplayer · Local Multiplayer · Online Co-Op

Duck Game
Shared: Multiplayer · Local Multiplayer · Funny

SpeedRunners
Shared: Multiplayer · Local Multiplayer · Racing

Among Us
Shared: Multiplayer · Online Co-Op · Local Multiplayer

Bread & Fred
Shared: Local Co-Op · Co-op · Multiplayer

Stick Fight: The Game
Shared: Multiplayer · Local Multiplayer · Funny

Human Fall Flat
Shared: Multiplayer · Co-op · Funny

PICO PARK 2
Shared: Multiplayer · Online Co-Op · Local Multiplayer

Cuphead
Shared: Co-op · Local Co-Op · Multiplayer

Gang Beasts
Shared: Multiplayer · Local Multiplayer · Co-op

The Escapists 2
Shared: Multiplayer · Online Co-Op · Co-op

Pummel Party
Shared: Multiplayer · Online Co-Op · Local Multiplayer

Bloody Trapland
Shared: Online Co-Op · Local Co-Op · Multiplayer

A Way Out
Shared: Online Co-Op · Co-op · Multiplayer

PEAK
Shared: Multiplayer · Online Co-Op · Co-op