The rule is simple, you have to collect bubbles that will be asked on the top of your screen and avoid every other bubbles, the game will go faster and faster so try to stay alive to make the best score!!
You also get gold when you catch a good bubble, with this gold you will buy skins.
Now there's also a laser bonus (red eye) that will help you to make even better scores!! More bonus are coming.
You can Also try the BIG mode, in BIG mode you won't die instantly by touching a bad bubble, you'll get bigger and bigger until you're to big for the screen and then lose the game, good bubbles will make you lose weight!