I liked the theme interpretation and thought you executed on it well. I can definitely imagine people getting very good at this game; I'd love to see a multiplayer deathmatch game based around this idea. A couple of the controls felt a little clunky. For example, the grappling hook felt buggy to me until I realised I was holding it down, rather than just clicking one. Instead of click to shoot it, click to cancel, I think it should have been click and hold to shoot it, let go to cancel, but perhaps that's personal preference. Graphics were simplistic but worked well, and the enemies were well animated and varied. Nice entry!