Pop balloons in Plane Popper!

Dec 26, 2015

12/22

Adjusted blimp collision boxes for better fairness.
Blimps don't move up and down as much.
Rockets hang longer before exploding to allow more time to react.
Rockets appear a bit farther away.
Made non-power-of-two graphics POT to fix issues on some devices.

12/21

Added a new button.
Mountain and city background now scrolls at a different speed from the obstacles.
Firework sparks are bigger.
Blimps can appear at different heights.
Improved engine.
Preparation for new features.