The video of that is a bit old; the newer version has an intro, boss select, scrolling levels (When you hit the bottom of a 22x20 screen size it scrolls down ala Mega Man), fixed screen focus, baddies, and ladders.
It would play the intro every time you connected, and save your progress. It was planned to be almost *exactly* like opening an NES game in an emulator.
Forgive my story writing skills, but it's just about as good as your standard Mega Man game ;P