I loved that one. Raptor was just like plugging out your brains and destroy everything that comes into your way. Unfortunately, as Spawn said, when you got all weapons it's becoming boring fast...
My tactics was to save all the money for that homing minigun and then add all the extra stuff like plasma and mini rockets to it. Worked pretty well, but you needed a whole bunch of shields every level later on.
I love Raptor

k: