Every enemy can now show up in a Halloween costume, two bosses came dressed up too, you can play as a skeleton, and the main menu has a song of its own: Graveyard Shift.
Costumes - every enemy can come dressed up: Frankenstein, scarecrow, black cat, devil, mummy, vampire, candy bucket, spider and candy corn, next to the pumpkin heads, bedsheets and witch hats
Boss costumes - THE REWRITE with a jack-o'-lantern head, SOON™ as a bat
Skeleton - a costume for you, DRESS on the title screen, for every career rank
Graveyard Shift - a song of its own for the main menu
Kill feed - costumed enemies show what they came as, and so does the game over screen
Wave 13 - pumpkin heads and candy buckets light up the dark, and eyes glow in their costume's colour
Costumes - both players see the same costumes, and player 2's skeleton wears a cyan cap