I really enjoyed this! I'm a sucker for wordless storytelling, and I really liked how the art and the gameplay worked together to reveal the narrative. The 2.5D style was great, too!
I do wish there was someplace that showed the controls; they are fairly intuitive, but I only was able to find out about shielding from reading other people's comments. Besides that, I think the game did a great job at teaching how to play, like when it shows how deflected arrows can kill a whole row of enemies. The boss was a little unclear to me, though. I think it would have been good to have some indication that reflecting its attacks hurts it, because it kind of looked to me that it just reabsorbed its matter. I also noticed that there were a few times that the sound didn't seem to sync up with actions, but that's a very minor thing.
These are nitpicky comments, though. I thought this game was done really well!