- Removed states/play.js as it is no longer used and is succeeded by play_easy, play_medium, and play_hard
- Added button click sounds to all menu buttons
- Added a back button for the difficulty screen
- Added a new image for the point gaining item
- Added missles for the player character to shoot
- Enemies can now be destroy by missles
- Player now gains points upon destory enemies by missles
- Updated the atlas.png file to include all new assets