Well, I managed to do some very important work and... fixed the loading screen:

The text is no longer talking about the "other game" and the bar is always in the middle instead of sometimes being annoyingly off to one side...

Much more important than these other things:

• Lots of moving shared code around so that I don't have to keep syncing things (as much)
• General improvements to the UI (progress bars can now have different styles for the filled/non-filled parts, sliders actually work on touch screens, etc.)
• Turrets shoot at enemies now
• Buildings can be rotated
• Builds can be cancelled

Yes, they're still all placeholders... and the ground isn't flat... and I'm still building on a beach for some reason.