I liked this a lot! I really like rhythm games. One thing I wouldn't mind is more feedback on when the hits are registering on your own anvil. I wish we got a sound effect like the blacksmith; then I would know how to correct myself if I'm slightly off. I can see when I hit, but I feel like I need a sound to sync it up properly and feel the rhythm.
Again, great job making an unexpected type of game! I had a lot of fun!