A lot of great points all around. Clearly the community is mixed on the issue of bubble shields, with about 60% favoring and 40% against. I agree that balance issues are essential to get straight - should shields only block 'death from above', or should they be 360? I think linking them to power is important, as it adds a mechanic where attacking power is a powerful strategic move. I like the idea of making them large movable titans as well. I do think it would be very possible to balance them. For one thing, PA simple isn't susceptible to many of the turtling concerns that plague other RTS. Sure, if you tip the balance too far, it can be. But in general even with strong defenses, on most maps the aggressive player will amass such an amazingly large economy that the turtle can be crushed. I like the idea of sending a massive legion of units all around a bubbled-in turtle, wailing three nukes down or even an asteroid just to pop the shields and invade. Great discussion all around.