Start the ball two clicks to the right to try and dislodge the exposed capsule. Keep firing the ball up this channel until you have cleared out a path. There’s not much to this level — just keep the ball under control and methodically work through it.
If you get the Gun on this level, destroy three of the low-hanging unbreakable bricks. This will give you an extra escape route into the C-shaped chamber. The Bomb is actually useful on this level — it can help you clear out the channel a bit quicker.