The graphics are fantastic and the music and sound effects are really good too. I like how the sound increases in pitch as you get a higher combo. The battle system is also pretty interesting. It's a shame it's unfinished.
I feel like it's a bit hard, though. It's very easy to die because of a couple of mistakes. This is mainly because losing a combo is so punishing. I think it would be more fair if the combo reset between each attack/defense phase, or if it didn't increase/decrease so dramatically.