Hi, I got the second old key and when I tried to use it on a lock it just disappears, I'm wondering if that's how far the public version goes or if I'm missing something.
That's all of the game for the time being. As I understand, that second gate will open up in a later update - if you transfer your save over, it should remember that you used the key, and should open up. But that's when that's added to the game. For now, you've probably seen everything.