"Woohoo! Nearly at 3,000,000 feet finally! That achievement is mine..now all I have to do is pr- WHAT THE HECK! WHERE DID THAT SPIKE COME FROM?? IT'S ON A BALLOON! NOOOOOOOOOOOOOOOOOO!" Story of my life right there.
After I unlocked swarm only I choose it. Heh, bad idea. Those things blur across my screen like no other. ._. Didn't even see them! Well, this is a great game. c: Had me going for like....5 hours...or 10, something like that.