Plutus offers a very defensive position for your colony. Multiple long plateaus provide the perfect place for turrets. But there are multiple locations outside of this defensive ring that you will need to make hard choices about. That Fission Reactor provides valuable energy. There was a Metal Refinery on the map, it was destroyed by the transport dropping scarabs beside it. And an Outpost in a vulnerable position.
You don't have to defend them all to win, you only need your colony to survive. But you will need to make some hard decisions. Should you upgrade that Metal Refinery to increase its output? Can you keep it alive long enough to make that investment worthwhile? Are you willing to spread out your anti-air to protect your resources, or do you consolidate them around your colony? Do you deploy Milton to guard your Fission Reactor, or keep him to block a choke point and maximize the damage the surrounding towers do?
That's all part of what makes it interesting and I am always surprised when I see players approaching it with different strategy, towers and upgrades than I have (often they are much more successful than me).
It's also worth noting that we have updated the icons and particle effects for the next beta and you can see some of that here. Lot's of great stuff is on its way.