Hey i gave it a go, i have a bunch of feedback notes:
When you fire a weapon there's some cockpit shake but i think the vibration on it is too high frequency and maybe needs a cubic fade out if it's not already doing that. i think it's the same effect as the "take small damage" effect and i'd say the same for that one though maybeup the shake amplitude. When i get hit by a rocket i think the cockpit is playing a "jumped" animation without playing the shaken effect which feels very weird. It could also use some "i am inside a machine getting destroyed" audio for getting hit. Some metal getting scrunched or something, maybe red flashing. The character and their reactions are probably my favorite part of the demo, but they're hard to notice while getting swarmed.
The sprint/boost game mechanic i kept having a bad feeling about, tried to figure out exactly what's going wrong. I think the issue is controls inconsistency. If im holding forward and right diagonally and shift, then only hold forward, the boost movement sound effect is playing but i'm still going slow, i suppose it did a sudden dash movement then gave up. I'm not sure why i'd ever want to use the short dashes, they don't go very far. i can just hold w, shift, never let go of shift, and i get the best mobility in every direction. if i'm holding shift then a direction it skips doing the dash but letting go of movement keys to not dash feels a bit awkward.
Radar feels very short range considering the scale of some of the levels, id suggest using a log distance scale radar or something. it wasn't obvious that the health gauge and time guage were different parts of the ui at first. sometimes the weapon cycle shows the wrong weapon as next. the railgun and laser don't seem to shoot straight at long ranges, some kind of convergence issue maybe.
All that said i think the part of the game that stands to benefit the most from some work is the shaders and lighting, not sure how easy that is in godot. I had some fun zooming around in arcade once i figured how how to play and that i need to keep shift held down all the time.