Lol I guess we're somewhat on the same wavelength, I actually have a game I started before this one and it's an action adventure open sandbox game. I had plans to make it into the sequel eventually. Maybe some sort of alternative ending type thing. Based in a world where Zenki left the tower
true but you could make it in into the sequel game to but it could show how everything happened on how he got trapped in the tower and how he escaped but also leaving it open to roam around freely afterward but could you add some sort of skill tree with passive skills in the current game and the might be a limit to how far down it can go