My favourite gun is the disk shooter, because during the times when there's nothing else to shoot at, you can fire upward and they start coming down in a shield wall - great for hitting the weak spots on the fortresses, the teleporter carriers (also takes out those annoying teleport drones in one shot) and the elephant looking things.
Also, it starts with reasonably high damage so damage buffers give you a good boost.
I usually use one barrier, disk shooter and add damage boosters when I can.
Only problem is, takes a lot of practice to shoot the drones down.
So dissapointed that It doesn't work properly on my computer - sounds like instrument 1 only plays the notes when it feels like it. :L
But fantastic sound when it does play and very easy to use - 5/5
On the bunker level with vents: if you destroy the vents by accident, you can get underneath by going to the far end and blasting thrugh the walls.
If a unit dies, click pause: menu.
Once the enemy start using AA guns, the spy is the most useful unit.
Came back on today after a week of not playing to find my save file completely gone - no i didn't back it up like it said. :L Great game but will take too long to level up again.
Sad to announce a tragic accident today, the turbo elevator broke and left one of our best janitor's heads stuck out of the ceiling. Despit our best efforts to release him - including trying to move him and even fire him - he will not budge. Other workers have expressed outrage... that he hasn't yet fixed it...