Hi, here is how to make a space game from scratch

Supplies

For this all you need is:

A scratch account and a computer.

Step 1: Add a Backdrop

To pick a back drop, click on the landscape icon in the bottom left of the screen and pick your backdrop.

I used space but you could use any you like

To add sprites click on the cat icon, right next to the landscape icon and select your sprite

Or you could create your own sprite by clicking on costumes

For this step you could use your own code or refer to the picture

For the last step, add the levels and score

To create levels, take out an if block from control, take out a = block from operators and put in the if block, set your own score and your done

And for the score create a score variable, add it to your code and your done