Thanks! Yeah, the firing up is kind of weird, I should make the projectiles faster and/or make the trails longer, because at first the enemies are pretty far away, and it's definitely difficult to tell if you fired accurately.
With the changing cover, I was hoping to have the ground enemy ai a little better, using them for cover and all, plus giving the player cover, but it definitely needs more work/find tuning.
An idea I had, but didn't get a chance to implement was to ( in addition to the pilots appearing when you destroyed a ship), have waves of squid enemies run through the ground and attack you (dumb enemies that just race to your location in a swarm and either attack or explode), so you couldn't ever just look up, unless you where playing on easy.
After the jam voting I really want to do more work on this.