Nice score!! In the new version will be better to make high scores as I changed the time to kill them, also the citizens speed was modified to have better gameplay.
Currently, the "strategy" is to switch the weather, using the white cloud to bring the citizens to the middle of the screen, then switch to the gray and start to rain to kill as much as you can before they run away from the screen.
In the new version, the citizens will have an alert status with the gray cloud.
Indeed the apocalypse music would be a better choice, sadly we already used some rain/city loops,
We appreciate your feedback, I hope you play it after the new version ^^