That reminded me of Assasin's Creed trailer:D. I dont remember which one though....
But yeah.. cool idea. And maybe your robot will be slightly buffed, for example: enemies cant block your sword attacks, but theres like A LOT of enemies, like you said. Maybe it gonna be like one of endless mod wave/level or something. I really do love to cut through metal with laser swords and stuff too, yeah C:<.