Hi Zen! Unfortunately it's not possible to fullscreen the game unless it's coded in ;w; but I'm learning how to do it, so I can implement it in the next update hopefully! (I apologize the feature isn't there yet, I never thought of somebody wanting to use it ;w;)
As for the screen, does it freeze after an event in particular? I mean, in the same point of the game or in random points? (The latter might be a CPU usage issue)
Thank you for your patience!