Change log:
- Added blue/red alternating colours to obstacles to make them easier to see.
- Edited runs to generate half the amount of obstacles, but twice as fast.
- Added a score multiplier! Pass adjacent to obstacles to increase your multiplier. If you get hit or don't pass adjacent to an obstacle, it resets to 1.
- New GUI using NGUI.
- Moved next level text to the top to make room for new UI.
- Tweaked difficulty - should no
