I like all the animations you had for the main character with up and down frames, crouch, etc. I was stuck right after getting the bow and arrow for a while... would have been nice to have some in-game clues that the tree/vine things can be climbed. (the earlier two had red things at the top but you could have drawn more attention to them... or some games even put arrows to tell the player to go up)
I enjoyed the ballistic trajectory of the arrow... it added a dimension of difficulty to try and find the right distance to strike an enemy.
For the most part, the graphics looked really nice and almost NES-like. However, I felt like the moon reflection did not complement the rest of the graphics.