To reiterate what others have been saying, the movement is completely solid. The fluidity of jumping around the structure is heaps of fun.
Unfortunately I had a bit of an issue that my wired 360 controller didn't seem to work, so I needed to use mouse and keyboard. It worked nicely, but at some point the cursor became unlocked and visible, making the mouse behave a bit erratically.
These issues aside, I am very impressed with the polish displayed in the gameplay here, great work!