Try to find the 1x1 Pixel, right click and press "Forward", then rightclick again and press "Play", you can then watch a crappy stick animation 2DArray has made!
A nice addition would be to add a "Lock Position" button so that your Dartling towers dont have to stop shooting bloons when you're trying to put down new towers or upgrading.
There is 2 Alternative Endings, well, i dont know if this counts as an alternative ending, but: Fly really fast towards the ground at high altitude (Dont use Whirlybird if you're going to do this) and watch the earth END!!!
 "Vincent Coolio")
 "Just Chatting")
 "Legend of the Void")
 "Bloons Tower Defense 4")
 "Flaming Zombooka 3 : Carnival")
 "Learn to Fly 2")
 "Harry Quantum: TV Go Home")
 "Super Ack-Ack 0.2a")