This game SCREAMS 90s at me. I don't know if that's what you intended, but the laser tag / blacklight bowling alley vibes were immaculate. The ship launch also felt right out of an old mech anime or something.
I didn't notice at first that the flow was to play down to the wire, then retreat to repair, then come back. It might be good to call that out more on the first run.
Another thing I noticed was that the waves seem to restart every time you return to the mission. It would have been cool to be able to keep your place to make it easier to get to the end. Maybe I'm just not great at twinstick shooters though :P
Couple small bugs: sometimes for the little ships, the explosions all trigger at the center of the map. Also, seems like occasionally the enemies stop spawning after the first wave, but retreating and coming back fixes it on the next run.
The actual gameplay was pretty fun! Just enough room to dodge shots, and a spicy "oh crap" moment when a new wave spawns all around you. Would have loved to be able to do a barrel roll at those moments. :P