The idea is very cool and I loved the puzzles but I feel like the execution of the controls and stuff feels pretty weird, it took me a while to understand exactly what I was doing, maybe with some small touches it could be polished into a very cool full game with more levels and new mechanics similar to the portal and all that.
For the movement of the weight guys I would recommend probably to borrow from the style of RTS games like Age of Empires, having you select the units you want to move and then right clicking a point to where they would move.
Well done!