I adore the alien jazz soundtrack, and the way you indicate health without a health bar. I also giggled at thinking what this would look like in real life, if society had built a country-sized cannon that looked like a USB stick. Would the propulsion of such a powerful projectile send the planet out of its gravitational pull? With more development time, that could be an interesting feature: don't let Earth get too far away from the sun.
It's clear you really paid attention to juice on this one. Bravo!