@Muadib999: Drag the lock pick around with the mouse until it wiggles. Once you find that spot hold the mouse down and after a few seconds it will open up. I suggest dragging from farther out on the pick so you get better control.
If you place the tank (tower mode) right inside of your gate it provides a nice secondary barrier if your gate should fall. It's also a nice bit of fire support against runners. Make sure you feed some cannon fodder out there to get the sacrifices you need to summon the greater spirit.
I think that Nazi 'nades could be a little more fair with AoE. And perhaps allow a 'fire at ground/area' feature. Sorta like designating targets but so that a 'zooka doesn't fire 40ft behind someone.
Shock/splash seems to do a terrific job on pretty much everything. Since the dual penalty still leaves shock at like 10% and it effects an area it's a pretty good combo. Now I just gotta mop up the last few shiny frames.