I usually don't rate games on a scale but if I had to, it would be N/A because this game is more of a tech demo in a sense. You get too little time to shoot down your enemy and there is no graphical representation when you do so, it just says proceeding to the next level. I mean the developer has some good ideas but the demo needs to be more complete. Maybe you might find it interesting for a break from your work or house duties ETC but not worth it enough to keep this in your library.