Space is attack, Tab is inventory, the chests with the glowing upward lights Press E to interact, drop items, exp. Loot chest till you find weapon, avoiding mobs till you get a weapon and and then kill the mobs and look for the quest person, the stuff you can't pick up is quest items? I believe. Game become fun after you figure it out. Have not figured out how to sell or drop items from inventory. Find essence and drop them off at the Portal to advance to the next floor.