I really loved the colored retro pixellated style and the various sounds. That's fun to listen for the first time the little sound telling you that you have no more bullets. Why did you choose to deactivate the great music by default ? I also like the font ! Where did you find/buy it ? Alternate between low and high elevation might be more than visibility purpose. It's a good way to align baddies and do combos if we suppose that the laser goes through the mob. I see the hard work provided in the menus, leaderboard, animations... it's sleek! Great job.