To win the majority of levels you'll need to constantly be searching through all the items in the building you're defending for an amp, a half stack and an electric guitar. This is where Mike and Foxy come in handy as they search boxes very quickly, and if you aren't directly controlling them they will automatically search everything in the room they're in until it's completely bare. Similarly with Jack, he will automatically destroy all the furniture if you're not using him.
It's a title that's well worth trying out, with the only real flaw being the lack of online multiplayer, a note pointed out by user soad667 in his review on the Dead Block page. Check out the trailer if you're interested: