Could have been better. I think the graphics were fine, and the music was very orchestratic, I like it. All I have to complain is about the controls. It would have been better if Z was jump and R was poison. The animation needs polish too.
Sword is sluggish, I would recommend it at least gradually becoming faster as you get a better sword.
Level design was a bit lame, but it could have been worse. ;P
This game seems one themed, it looks very much like it would be havig a sequel. Like a fire land, water land etc. but it's your decision. I would like to help/make a fan-remake but I don't know how to code and I can't draw either really. It's OK if you're busy, I understand.
I would have some little suggestions though.
-More backstory/maybe a sequel
-Kon should be chibi-style on the map, maybe with 2 or 3 animation frames. Basically much smaller, and having a walking animation when "moving" to another level.
That's all about it, if you polish the game I could have even gave a 5!