Save the Castle!

A horde of evil Gregs are swarming towards your castle. You must place and takeover towers to stop them!
While holding the tower placer, holding trigger starts placing a tower. The tower will be placed where the ghost is.
Holding A/X in the hand holding the placer opens the inventory. Pick  up and grab the new tower, then touch it to the tip of the handle, where the old tower was. 

Hold trigger while holding the Takeover item to takeover a tower! Use the teleport movement (hold right trigger up) to leave a tower