Binding of Isaac gets a big ol' Halloween update

Edmund McMillen's slightly disturbing indie dungeon crawler Binding of Isaac has been extended and expanded on this, the most spookiest of days. Don't expect any seasonal additions, however: In lieu of Jack O' Lanterns and mutant candy corn monsters, the free update features new bosses, a new playable character, an additional ending and a fifth chapter, which, in a fittingly bizarre twist, is "unlocked after 10 mom kills." Check out all the new features after the jump.

The game will be updated on Steam by 3 p.m. ET today. It's probably not the scariest thing you could play today, though. If only it were as utterly horrifying as its launch trailer!

BIG HALLOWEEN UPDATE (with no actual lame halloween themes)

• Added chapter 5 (unlocked after 10 mom kills)

• Added 3+ new bosses

• Added 4 new enemies

• Added 20+ new items

• Added one new unlockable character (Eve)

• Added one new "FINAL" ending.

• Added 6+ new achievements

• Added 2 new music tracks by Danny B

• Added updated collection viewer

• Added 4 new tarot cards ( finishing the major arcana )