Start the ball off three or four clicks left, which should destroy the accessible capsule touching the left wall. When the ball descends, hit it back up the chute. This level isn’t too difficult — just keep sending the ball back up the chute on the left. If the bricks descend all the way, you might need to escape to the left.
If you get the Gun, I’d suggest destroying the three bricks under the words “breaker” and “guide” on the picture diagram. This gives you some breathing room.