I agree with darkreality that it can get a little hectic at times, but it is very fun. Also the fact that we can upload our own songs makes it much more awesome than it already was....5/5 and favorited.
Not to sound like a broken record, but there needs to be an option to turn off object collision so I don't get stuck in my own defenses. Or at least let us destroy our own barricades. One more thing, bring multiplayer back and this game becomes instant flash gold.