Very excited to see that the alpha is available!
One of my favourite methods of doing development work is in full screen mode with two split "panes" both at fullscreen – one for my terminal and editor (vim) and the other for running and testing code changes. Game Creator Pro doesn't seem to like being full screened in MacOS this way:
Resizing seems to work in windowed mode, but something isn't happy when using the fullscreen mode in MacOS. Not a deal breaker by any means, but it would be nice to see this fixed at some point.