This was really interesting as an idea but very hard to follow. There was no indication of when you actually press the arrows though I eventually figured it out, I saw no indication of how many moves I would get and when the enemies would attack so I didn't know when to defend.
The fact it had no music was definitely confusing for a sound game, and I didn't like that sometimes when I got the arrows right it took off less damage than when I got them wrong.
There was a lot of things that were frustrating but I can definitely see this doing well if you take it further.