So why are the Separatists invading a planet that's kind of already on their side?
Because it's TCW?
I guess it's another example of ROTS's "Saleucami has fallen" followed later in the same film by an Order 66 scene on Saleucami.
Perhaps it's more difficult to do in space with no gravity?
I was thinking along those lines myself... in 2008.
But then Rising Malevolence
came along and Plo Koon had no trouble Force pushing things around in space.
At this point I don't know how to address the buzz droid thing other than to note that Anakin apparently only pushes them away when he can see them.