I think there's a solid concept for a puzzle here! But I greatly would have appreciated a clear description on what was necessary to actually activate the other robots on the field, especially since the first three levels before the robot is introduced do explain themselves. And maybe even getting to those puzzles a bit quicker; this is meant to be the defining feature of the game, after all! I spent a lot of time pressing every single key combination I could think of before I managed to line up my robot for the tether to automatically join.
That being said, once it I figured that out, I got some good puzzle juice out of it! I might have preferred getting the capacity to tether and un-tether at a button press, rather than walking up to it, but I think that there's a workable concept that you can iterate on. A good effort made for 48 hours!