Players control the spaceship and fire the laser to blast the space rocks.
My share project on Scratch - https://scratch.mit.edu/projects/4004...

VIDEO CHAPTERS
0:00 Intro
0:47 Demo
1:15 Game Setup
2:55 Variables
3:19 Rocket Sprite
5:39 Laser Sprite
7:33 Rock Sprite
11:26 Game Over Sprite
12:58 Final Demo

You can also check out these 2 videos as well, it is a more enhanced version of this game.
Rock Blaster added Lives -    • Scratch Tutorial |  Rock Blaster 1.2 ...  
Rock Blaster added Shop (part 1 of 5) -    • Scratch Tutorial | Rock Blaster 2.0 |...  
Spaceship Adventure Game -    • Scratch Tutorial | Spaceship Adventur...  

We will be learning the following concepts in scratch:
Hide and Show
Repeat Until loop
When key pressed
Touch sprite
Broadcast message

You can find this game in "Code Your Own Games!: 20 Games to Create with Scratch".