An Instructive Attacking Game

Some may know a somewhat famous attacking plan in the hedgehog set-up where black plays Kh8 Rg8 and then g5-g4 starting an attack on the king. In the game Ippolito - Perelshteyn, black employs a similar plan without "wasting time" on O-O and Kh8. Despite the total lack of weaknesses on the white kingside, the loss of a queenside pawn, and the opening of the center, the GM finds creative ways to whip up murderous threats leading to an all-out kill-or-be-killed brawl.