Strength:
The core mechanic of using to your hat to swap with Humanoids is probably the game's strong point, and very entertaining as well. It's also a simple concept to understand yet a lot can be done with such a tool.
What I would like to see improved:
The level design here could be a bit better, especially with scaling/pacing across the levels. I felt the developer was a bit shy in exploiting the game's strength in the first half of the levels, introducing the game elements at a slightly too slow pace. Then there was a big jump in difficulty between the last levels and the challenge level (which was slightly frustrating, considered it was also longer.).
Good game still! ^_^
 "Hat Wizard"){kind=icon}