background change

changed the background of my game
sprite sheet

changed the sprite sheet for the aliens, ship and missiles
forward motion

added code to make the ship move forward
sprite sheet changed

changed the sprite sheet again
added levels

added three levels to my game, to give it a total of five
changed speed and fixed error

change the speed of my ship and fixed an error so I could move my ship
forwards
Score board

added score board
constructed first two levels

constructed the first two levels
constructed levels 3-5

constructed levels 3-5 and made some changes to the first two levels.
Change sound effects

Changed the sound effects for the explosion and laser
updated sprites

added images for explosion and different laser beam for enemies to
shoot with
speed

made the game slower
background

tried to add background to the main screen