Buggy but good
I'll start with a list of bugs:
If you shoot an alien that is already dying, he'll restart his dying animation, thus he'll die later than he would have... from more firepower
In other words, they don't die until you stop shooting them, which is strange (if I remember correctly, they still keep moving towards you during this time).
The guns were weird. Shots went through monsters, and stopped at the mouse cursor... which is weird... Is there actually an advantage to actually aiming ON the monsters?
The jeep's missile followed the cursor when we moved it. Which would have been ok (guided missiles!) if the explosion didn't do so as well.
Otherwise short and sweet. I loved the flamer, btw :P