How to deactivate all noises from my iPhone?

I turn on the "do not disturb" in settings for my iPhone when I don't want it to make noises, and though my vibrate switch is screwy, it works most of the time. Nevertheless, my iPhone still makes annoying alerts when I have all of this enabled. I recently downloaded a game called "TinyDeathStar" and it alerts me numerous times while I'm not playing. It's obnoxious because it's R2D2 noises every time. How do I tell my iPhone to shut up?

Added (1). It's flipped.

Added (2). I meant… It's been flipped. Doesn't work.

Just flip the little mute switch in the corner, thats what I always do.

Turn on assistive touch and activate mute from there. Then go to notifications and turn those notifs off.

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