This was a really fun experience! I think the menu and GUI were done very well - however, more visual indication of what was happening and what consoles were etc. would have been nice.
I also think the firing animation should have been more useful and show where the bullets were going (though that was done slightly by the alien damaging animation) - however, that and other small fixes cannot be done in a jam-like environment with such a short time. Given the time of the jam - this was very impressive!