This is an amazing concept!
I loved the idea behind controlling the robot with the floppies. The only real criticism I'd have is that it got a bit twitchy at some points where it relied on your having to swap disks on the fly, but maybe having the option to slow the robot speed would have been enough to solve this, without turning it into a turn-based type of thing? That's a very minor point, though, and just removing the 'Walk' command seemed to give me enough time to plan out my route satisfactorily in most cases :D
I didn't actually play more than a handful of levels but I'm definitely coming back for more!