You escaped the orbital space station and survived the explosion. Dr Rycroft left co-ordinates and now you need to investigate what experiments he performed on you. Beware though, he has surrounded himself with hi-tech defenses.
Use the tower's new and unbelievably cool Super Activated Abilities to lay waste to the endless swarms of balloons. You'll need all the firepower you can get to combat the new Balloon types and new tracks with moving parts and tunnels.