Enjoyed the game!
Really liked the feeling of exploring the world. I think the idea could be really cool if it was more fleshed out, such as more content in-between each letter such as enemies and story. Although it's a short game when I found a letter it was a really nice feeling and knowing where to go after seeing a letter on your journey was satisfying.
I did come into the double letter bug that a few other people mentioned though which is unfortunate. Didn't really take anything from the gameplay though :)