What is your model number and I will tell you how. One LCD is not the same as another. 700:1 contrast is not going to give you the same results.
It was a cheapie at the time I bought it about 5 years ago. I just revisited the game a few moments ago - it's not as bad as I seemed to remember it. The asteroids are a bit dim mainly because they flicker somewhat as they are moving across the screen, but the main problem is still the bullets as they only seem to consist of one pixel each. The players ship and the enemy space ships are very vivid and easy to see. I'm guessing that my problem is that the monitor is just not up to scratch - all other games look great on it though!
Model: CMV poyview V293
* Device Type Flat panel display / TFT active matrix
* Diagonal Size 19"
* Viewable Size 19"
* Max Resolution 1280 x 1024 / SXGA
* Brightness 330cd/m2
* Response time 21ms (Tr+Tf)
* Compliant Standards TCO '99
* Power Consumption Operational 51 Watt
* Colour Support Up to 16.2 million colors
* Colour Silver
* Dot Pitch / Pixel Pitch 0.26 mm
* Built in Stereo Speakers 2 x 2.5W
* Contrast Ratio 800:1
* Dimensions (WxDxH) 418 x 431 x 232 mm
* Weight 4.6 kg
* Power AC 110/230 V ( 50/60 Hz ) 19VDC 3.42A
*update*: just worked out the game is much more playable at night time with all the lights are turned out - much easier to see the bullets (though still small and dim)