The extra items that I worked on was:
- creating the crystal from scratch
- setting up a life model
- level design
Outside of the tutorial, I also implemented different sound effects, fonts, backgrounds, and set up specific impacts depending on the block that was hit.
All assets were from free sources, but I wanted to share the results in screenshots:
Start Menu:

Level 1:

Level 2:

Level 3:

Level 4:

Level 5:

Game Over:

I am continuing onto the next Unity 2D game which is laser defender next.