One star, little complaints... Two stars, we want stuff! Fixed... Three stars, we want bigger stuff! Fixed. Four stars, we want everything, then not this, but that! Fixed. Five stars, destroy the elevators, you're trapped forever! Muahahaha!
I would suggest taking out the ceiling entirely. When you shoot up to the top, you get bounced right back down, taking away a lot of momentum and distance. Let the critter go off screen, and put an arrow to where he is with a height (hate to say it, but Turtle Toss had that one right.)
I can't even play it. The mouse doesn't move the aim point. The only way I can move where I'm aiming is to shoot and let the recoil move me around. Good ceiling shooter... Now fix it. (Did it in Chrome & *shudder* Internet Exploder) Would only play on Firefox.