- Undocumented: [Shift] toggles between first person and top-down

- The camera tumbles endlessly if a perspective change finishes while the tab is unfocused -- I discovered both of these after using [Ctrl]+[Shift]+[Tab]

- The enemies have randomized speed and use lead pursuit; this is quite effective at preventing them from stacking up behind the player like they do in similar games

- Enemies only turn left and will turn all the way around in order to turn right -- you can make them dance in the middle of the map by circling clockwise along the wall, or stall them by moving back and forth

- It's pretty common to make players slide along walls when moving against them at an angle. That does make less sense for a tank, though.