A quick help if you still want it:
Click on the fuzzles as fast as you can. More fuzzles come out the more that you wipe out. Also, after every level, ALWAYS buy the gun upgrage. Until the last two levels, you can always kill a fuzzle in one shot with the latest gun. Lastly, be sure to get ten in a row without missing. If you do, then click on the money bonus that will be 10x3 for an extra 30 points!!
If you want more help, either mail me here or at neopets. (My u-name is the same here as it is there.)