If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The rain cubes might be falling down, but you need to be moving up.Bounce the ball up as high as you can by hitting the cubes. Touching golden cubes will double your score. If you fall down to the bottom of the screen after touching a block, the game is over.
Mouse key - To move & bounce.