I thought this game was well put together. I new what I was supposed to be doing. Once I figured out there were different biomes I could pretty easily figure out were all the mushrooms roughly were. I though highlighting the quest giver was a pretty economical solution to help players not get lost. One thing I would suggest is looking at the water. I can walk on water and didn't hear any splashing sounds. You have a few ponds around and an ocean it's probably worth looking into.