A Little More Aggresive

A few little updates today. The bird eggs were stacking too much. They were made a little slippery, but still stack,  just not a much. The game seemed to flat-line in difficulty as the waves progressed. To fix that : The empty birds get gradually faster to pick up their riders as the game goes on. The enemy buzzards flight system was updated a tad so they fly with less predictability. 

I also set the default game mode to Normal, mainly because high scores and leader-boards are not reported in easy mode. The high score screen was updated so it looks a little better.