The music and graphics are good, but there are a couple issues:

• Swinging my sword doesn't seem to have any effect on enemies most of the time. Once in a while when I hit them, it makes them partially transparent so I know that they are low on health, but most of the time nothing happens. I don't know if there's issues with the collision masks and most of my attacks don't register, or if they are registering but I just have no way of knowing. If it's the former, then maybe try adjusting the collision masks so that attacks that are clearly landing have an effect. Also, adding some sound effects would go a long way. 
• The game closes every time you die which is extremely annoying.

Still, it's pretty good for a first game: Definitely better than mine.