The folks at Comcept shared a look into the making and testing of Mega Man spiritual successor Mighty No. 9 when they first showed head honcho Keiji Inafune playing the Alpha build. Now they're back with a much longer version of the clip, putting more of Beck's work-in-progress moves to the test.
You can also read more about the latest development updates over at the official Mighty No. 9 site. The most recent update had Inafune criticizing the dash and providing some wisdom for making it more fun.