Eh, I had just started this like the other day and the level is mostly just a test room right now- to test and showcase each of the physics features implemented so far...

Rolling is not implemented yet, later after a nice nap I'll be able to go derive the necessary formulas on me trusty whiteboard

Also the different floor surfaces have different amounts of friction so on some you'll be moving comfortably and some you'll be slipping around.

As for the window size, I had posted this while at work and forgot to add a certain line I usually put into code to make it adapt to the user's screen size.
The link on the original post has been changed to a fixed version...