See Portal Dungeon in vid form, watch here.
"Portal Dungeon is a side-scrolling Roguelite adventure game that supports up to 4 players in co-op mode. You control an adventurer as you and your friends bravely set out to find the last portal in this world. Go forth! Defeat powerful enemies! Save the world!"
At a glance categories:
Action Roguelike, Multiplayer, Pixel Graphics