Here's a tip, if you move the mouse out of bounds, you can move it back in bounds somewhere else on the screen and it will "skip" there. You won't hit any bullets between where you left the screen and where you enter again. Helpful on the stages with the long slow mo shots if you get boxed in.
The game would probably see far more traffic if the arenas were reset every now and then. People would have far more confidence in coming back if they knew Malkan didn't abandon the game and there were actually things to do.