Dude, I am all about the juxtaposition of classical and drum n' bass you've got going here. It marches, but not too malevolently. Could easily be a cinematic theme.
Maybe, just maybe, turn the volume down on the drumline just a wee bit, it kinda overpowers the piano; there's excellent stuff going on back there, but the high hats and snares get in my face a bit. ^_^; But it does clank and clatter, giving that "locked up" theme some presence... so that's nice.
Please contact me if you would like to use this in a project. We can discuss the details.