You're Aleks. Each room is a round: chatters pour in through the doors. Clear them all — the last one drops a key. Grab loot, then take the key to the glowing door for the next room.
Lurker — slow, in packs
Spammer — fast, weak
Backseater — shoots advice
Troll — tanky, knocks back
Sub bomber — explodes
Crate — break it
WASD move · mouse aim · touch left = move, right = aim