I agree with @Jaxah about the movement of the craft being too twitchy. The game has promise and the visuals are good. The choice to defend or invade is compelling. I was not ready for the music, but I appreciated the whimsicalness of it. The high score vs the health needs to be separated, in my opinion, and more differentiated for clarity. You have a possible addicting game here and I would like to see the progress you make on it.