War in Vacuum - 2D Shooter

I have done the following:

1.  Changed the Background music.
2.  Changed the UI for Main Menu, Pause Screens, Instructions, etc.
3.  Added a minimap.
4.  Added a new Font.
5.  Gameplay changes - Made 3 levels. 
   1. 1st level is to defeat any 9 enemies.
   2. 2nd level is to kill 33 enemies hiding in the maze and to reach the Space Ship with the help of the MiniMap.
   3. 3rd level is to reach back to the planet without the MiniMap and to kill 33 new enemies.
6. At each level, I have given instructions about that level in the pause screen.