YASS- Yet Another Space Shooter

Alright! Alright!  I did the Unity tutorial, you know the one, 2d Space Shooter, the one that had been done  a thousand times and uploaded everywhere. What's that?...Yours crashed?  That speaks a lot for our Mars Mission, huh?

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Jokes aside  the game is a (really) basic 2d space shooter I've made for a course on Unity. There's probably a few bugs and code is messy but still  shows some progress.

The code is freely avaiables at : https://gitlab.com/mvalentin/unity01-spaceshooter

Any suggestions and constructive criticism is welcome, better coding implementation (and resources/tips) are welcomed.