To make this game u must go to game maker 6 in programs. firstly u click sprites, choose a bear or space ship and click object, give a is objbear or objspaceship and setting your shooter with left and right event.
Click action and choose a if a expression is true is x>o and jump to given posisition is x: -4 and y: 0. choose right event and same action, but diffrence x and y number. go to sprites and choose bullet, enemy and explode. go to object, put your name objbullet and setting your bullet with create event and collision with objenemy.
first set your bullet action with set vertical speed is -20 and set your collision objenemy action with destroy the instance and set the score relative by yourself. Setting your enemy and give a name is objenemy, set your event with create, step and collision is objbullet. go to action of create is set the vertical speed with .01 and set your step and collision objbullet with action. go to object and give name of objexplode and set event is animation end and action destroy the instance with self.
u must make obj controller with create, but u choose a background music after u has a background music go to objcontroller and step event and set actions with if a number of instance is a value, after your find a value and click objenemy, number 1 operation smaller than. click go to next room and set with interlanced from top. if u want background colour u clik a add background and choose what ever u want in file. when u want playing this game, firstly making room for it and setting your room.
Have fun!!!!! 
