Cool stuff, grats on the theme, the 3D and finding the time to do an intro.
The intro would have looked really nice with some space shader to fill the background. If you could skip the intro step by step it would be better for hyperactive people like me.
It took me some time to figure out what was the point of jumping on those weird nova things (to recharge the shields). Spawning a text +1 shield at the place where the nova is would greatly enhance that!
Was there a “minion” death effect as well? I had a hard time telling when it happened.
I could not figure out what expand shield (RMB) was supposed to do? Or how to use it?
I think the difficulty could ramp up a bit faster, and maybe divide the gameplay in levels increasing in difficulty (spawn rate of the missiles, more/less population, …)
Also good that you worked on the sound design!