Thank you for playing the demo! The demo has now been updated to version 2.1b:
1. Added atmospheric dust particles to the scenes.
2. Removed the "frame-dropping" effect when enemies were hit by bullets.
3. Increased the score for eliminating enemies, as well as the score bonus from "threat level".
4. Missiles falling with less than 60 seconds remaining can now pass through high-rise platforms and crash directly to the ground.