Pause menu that doesn't crash the game implemented.  It's always been there but has been game breaking until now.  Feel free to pause!  Will update menu screen to show this.

Bullet power up changed.  It used to bring the fire rate down and make it faster, now it makes bullets go straight back and down.   The drones shoot forward and at angles.   It's possible to get very powered up now. 

I'm going to work on different sprites and different enemy types and implement obstacles that can be used as cover as well.  Hopefully I'll get that done in the next day of so.