I like the concept of the game (a never-aging classic), I also like special effects but the implementation is a bit lame:

1. I think that you need to swap the destinations of the right and left mouse buttons. The fact is that in 99.999% of the game with mouse control, the attack is carried out using the left mouse button, well, in about half of the game, the right mouse button is associated with movement and context menus, so the current control constantly confused me.
2. I think that small arms need mechanics to overheat is to limit the duration of the shooting. 
3. Ships should be smaller, I have worked a lot on this before and I can say that the optimal ratio of the size of the spacecraft to the height of the screen should be from 1/20 to 1/10. 
4. The friction is too strong, ideally, it should not be at all.

Graphics: I liked the basic style and post-processing, but it's better to redraw the spaceships.

Cool classic style space shooter!