Nice artwork and the concept is pretty sound. The general idea of placing platforms during the action works well. A couple of minor frustrations: the camera moves up but not down? A few times the wisp "fell off" the screen and didn't always come back. The other was the mousewheel to rotate the platform. Laptop users with trackpad might need an alternative, and the sensitivity was high on my Mac mouse so it was hard to control. You could do a two-step process: place, then rotate. But maybe at speed that doesn't work. In the end I just didn't rotate at all and the game worked fairly well without it.
Overall some nice touches, especially around the aesthetics.