A long time coming but worth the wait. My criticism of games designers so far is you're confined to variations on space-invaders - graphics change but game's the same.
The demo games are not great but I guess they are deliberately left simple so you can easily see what they are doing and use them for experimentation. Initially, the many menus and options seem confusing. I got stuck trying to enter yes/no answers, having skipped "keyboard or joystick left, right, up, down and fire controls work both games and program".
If you haven't written games before, some terms may well be new but the manual does explain them well. If you're still not sure, try it and see.
You can load previously designed backgrounds then, within the program, design and test animation of player's and enemy graphics, set colour, movement, collisions, explosions, etc. It will take time and practice but it really makes original games design possible. Hopefully, due to the delay in its release, Melbourne House will extend the £3,000+ publication competition for an original H.U.R.G.-designed game which, at present, closes April 30th. If so, have a go!