If your stuck at level 15, here's the trick: So at level 15, touch the girl and touch the skull then go left to survive the fire then go to the chest where you are in the start then go to the guy and put him in the chest. I hope this works for you! Glad to help.
I love the game but. I got an INSANE HACK!!
1.Go to Guild Quest
2.Complete the Tutorial on that grandpa (if your only a beginner)
3.Leave for the game on 10 Days Or 5 Days
4.Check your Gold XP