I had no problem playing this game. The graphics, plot and art design are great. The game play is fine. Yes hot keys would be a very good idea. Really I think this game will be great once it's ironed out a bit more. 5 stars for concept and potential. Difficulty level is fine. Sound wasn't working for me, so I can't comment on that. I like that you can just hold down the space bar to shoot constantly while directing fire with the mouse. I'm assuming there are only 3 levels so far, because I didn't open any more up after beating the boss.