Complete solution with answer and video walkthrough
That Gem is mine
Move backward on the screen by tapping its button. Tap on the screwdriver and drag it to the right screw on the shelf. Then move backward again and drag the barrel aside.


(Gundolf Puzzle) Fix the image

I must pass through this cave

(Gundolf Puzzle) Fix the image

Phew That was a crazy cave

(Gundolf Puzzle) Run away from the spells

That Gem belongs to my boss

So you finally got your precious gem

(Gundolf Puzzle) Put the herbs into the formula