A few bugs
It's good and I am happy to see you are getting experience with this program, I have yet to make anything of my own besides the tutorial.
Some things I would like to point out to you.
The score on the bottom right hand side is messed up and just shows a bunch of numbers changing, that can be fixed and if you re-read the tutorial in the program on the score you should be able to fix that easily.
Also, you should make it so your spaceship can only move so far to the right, and can't move out of the screen on the left, again that is shown in the tutorial, just a few minor issues that can be easily fixed with a bit more of your time put in to it.
Wasn't bad, but it would be better with that and sound, keep it up buddy.