Title screen

README.md

 - [ ] umbrella shields
 - [ ] music
 - [x] sounds
-- [ ] title screen
-- [ ] settings
+- [x] title screen
+- [x] settings

js/game.js

 initRainEffect();
 updateSoundButton();
 loop();
-start();
+gameOver('🌩 Cloud Invaders 🌩');