Sargent Park Gr8 Tech (Section 2 2016): Zach's Simple (REDEMPTION) Space Invaders

In my Space Invader Game you should use:

• my ship go left & right (A - Left | D - Right)
• a bullet sprite move up & down (Spacebar - Shoot)
• An alien goes across the screen and be destroyed by the bullet

Comments - I got all the commands and codes right, in this site https://scratch.mit.edu/projects/1055139/#editor

But for some reason its still not working...

I know this is late.