Quite good twist to the original, to let you live-edit textures within the game. The only things I miss is a preview of the block when editing textures and the ability to edit textures without having to regenerate the world. Which means you did a LOT in just one week, especially great for a first game. Be proud of it, I couldn't have done that!
I couldn't even have come up with the idea of a live texture editor like that!