This game is awesome. The pixel art and aesthetics are impeccable. I can't wait for it to release. I have a few suggestions thought:
-The visual clutter in this game is part of the charm, don't remove it. But sometimes, the cursor can be a bit hard to see, so add toggles for an aiming line and for making the cursor rotate constantly so it's easily separable from the scene.
-Allow changing controls, obviously. I wanted to change the 'Fix camera' key to C because I use it often to stop and line up a good rocket volley, and Tab is a little far.
-The overworld looks gorgeous, genuinely beautiful, let me rotate freely with Q/E so I can get lost in it, it's really nice. Maybe make the Z key return it to North orientation. The red line is a great detail. I hope there are more planets or environments later because the feeling of floating around in the map with that music is unmatched.
-Not really that important, but a fun little Survivor-like mode where you could upgrade your weapons after defeating a few waves could be nice.
-Not sure if it's normal, but on Mission 3, a few enemies weren't moving (and they couldn't see me behind houses) until I threw some smoke grenades at them.
-Not that big of a deal, but I play on a 120hz monitor, and it sometimes looks a little blurry when moving.
-Add a Shagohod :D
Again, great game! I wish you the best.