@Toroth, you can actually turn sound effects and music off (seperate buttons) in the pause menu and before the game starts. No music nor sound effects are played before you press play. Mute buttons don't get much better then that.
@gidey Go to the second room above the one with the target, then fall through the middle light. Then you can reach it. Though you'll need to remove the blocks first, so you should go through the hole on the right first. Remember that Sis doesn't get hurt from sunlight.