Art and audio are stunning, nothing to add. About playability, i find it quite hard, especially because a lot of things are activated only later. For example, the tab command would be much more useful at the beginning. A tutorial or a more balanced difficulty slope would be useful for the player. The first princess took long to beat.
About the plot, it's not clear who you are and why you fight multiple different people. The idea that you are the protector of the princess is really cool but in my opinion need a better explanation about why there are 2 of you against several different other warriors.