Enter the Gungeon is a bullet hell roguelike video game where every death is basically meaningless the the only way to progress is to buy guns. There are about 5 chambers and a Secret one.
Your main objective is to find the gun that kill the past.
Playing Co-op is fun but extremely annoying,when the other player is at the opposite side of you the screen go crazy and usually end but a player getting damaged.
Gameplay is sick, and It's extremely hard.Worth trying it
Plus if you own XboxGamePass you can play the game.