Love the graphics, raw and gritty. Very cool aesthetic.
I think controlling with WASD while being able to layout your ship would be a fun mini-game by itself if the challenge was a little harder. As it is you can just plant turrets all around plus the radars and you can't lose.
Perhaps a wider resolution so you can see more enemies (and they can be faster, bigger, different). Definitely needs some game feel as everything is more or less static.
Overall, I think this is a solid foundation and could easily be turned into a more in depth game.