Typically makes it: Game_X 2
Typically makes it a: Game_X Remake
Typically works for either.
I'm not sure I understood what you want to say. If I did, you probably want to say that remake isn't the right word for this project. In that case, I agree, originally I wanted to call the game "Aetheria Chronicles" and rename the old one "Aetheria Chronicles Prototype" but the moderator who moved my thread wasn't really happy with it and wrote "Remake" in the title. I didn't plan this as a Remake, but as a new, better version of the original one.
Anyway, it's not that much of a problem after all, that's why I decided to accept this whole remake thing. In the end, even if the plot changed a lot as I changed the role of many important character, the key points are and will be almost all the same. Most of the new characters will be side characters or minor characters.