Very cool game, the destruction is superb. Nice juice already. UI looks really good too, except the font scaling is off, some words I can't even make out. No borderless/fullscreen mode. Some utility and counterplay things to use would be nice, like smoke and flares against missiles.
The problem is that its way too hard to make things out, hard to see yourself, enemies, even bullets. I'd suggest to slather some color on the mechs and aliens, make the ground a lot darker generally.
I had fun, completed both levels. Keep it up.