Don't worry, I am not selling the game, and I have been doing this for 4 years and nobody has talk to me about it. The worst that can happen is they will ask me to take it down.
I'm not planning on doing a multiplayer mode, I am still trying to figure out how to get the original maps into Unity. I have done water, but I want to rework it.
Because there isn't a save function like that yet, I am working on a new version that changes a lot of aspects of the game and makes it closer to the original.