Cool stuff!
I really like how it fits the theme - every wave is the same so you can learn where to shot first arrow or where is the enemy that should be killed first. 
Also main menu with Minifantasy Overworld is outstanding. 

There are some minor things to improve:
1. The walking animation not starting right away (hero slides for a short time and then takes the first step) - I think starting Walk animation not from 1st but from 2nd sprite could improve it
2. (Maybe it is just me) Damage from enemies seems to be hard to avoid when in melee