Wow, this is a really awesome start! The art and direction is fantastic. Gives me the vibes of a mix between dark souls and something sci-fi. As other people have said, I think giving more of a visual audio cue that the player is taking damage would be helpful. For some reason trying to attack with 'x' wasn't working for me, but maybe chrome was being weird.
Good luck with the Super edition if you head in that direction!