This is really good for your first flash
Make their mouths move when they talk. It doesn't have to be perfect, but at least let them have anime mouths (the two-frame open/ close mouths). Also, try to make this longer. You could definitely keep going off from the "barrow in the graveyard" scene. You have good material.
I personally think Runescape is annoying and boring, but this was still a pretty good cartoon. Keep it up!