I wrote to Skydereign and was getting responses each time, but about 5 or so months ago, the responses stopped regarding an update to Game Editor. The plan was to see a window mode that allowed the player to drag and stretch the size of the window for a small or full screen.
I was hoping to implement that into my City of Rott Steam game before releasing it in February 2017 so I could offer a full screen window mode, rather than the one default window (720p size) it's locked into. I believe the Game-Editor update had technical challenges and that's the last I've heard from Skydereign. He did mention he had other obligations like another game project as a programmer, as well as school and work, so I completely understand why he would not complete the update if it was more complex to solve for all computers. I appreciated his efforts even so.
I would be surprised if Game Editor advances as a Game Creation Software with new updates, but would welcome it if it ever happened.