I have installed and played the game on my Android device and, indeed, when you are at the level with the bubbles, you simply have to press the bubbles from left to right. Don't skip any bubble, otherwise the game will end very quickly. Since the game uses timers, make sure you can do it very fast to get a bonus of the score. Just tap on the screen in the order the bubbles are (ignoring their position). It all has to be done in a successive order.