Your rotation speed should be faster if you stand still. As for shot range, they should easily go off screen if your computer can handle the game well. Shots are only airborne for a specific amount of miliseconds, so if your system is lagging, shots will have a shorter range than they're intended to.

I know this isn't a good solution for low-end system, I will replace it soon with a simple frame counter. My 1.4 GHz computer with 768 mb ram cannot handle the game very well and suffers from especially great lag at the gathering.

"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram