Aliens Attack!

This is a 2D Shooter game Project, the name of the game is Aliens Attack! I do not remember every modification I have made but I will try to, - I have modified the menu background, added buttons to level 2, level 3 and an additional level named freestyle. - I also made every level harder than the last by adding different sets of enemies. - I modified a new script and added a "enemies to defeat" at each level which tells you how many enemies you should defeat to win. - I added a restart level but...