From the article:
Inspired by a love of classic video games, Boss Monster is a “dungeon-building” card game that pits 2-4 players in a competition to build the ultimate side-scrolling dungeon. Players compete to lure and destroy hapless adventurers, racing to outbid one another to see who can build the most enticing, treasure-filled dungeon.
The goal of Boss Monster is to be the first Boss to amass ten Souls, which are gained when a Hero is lured and defeated. But a player can also lose if his Boss takes five Wounds from Heroes who survive his dungeon.