Very cool idea and also pretty clever implementation!
It's pretty hard to allow movement of 3D objects with the mouse only all while having a static view and I think you found a good middle ground solution that isn't too complex so it's hard to learn, but also not too simple to allow more or less precise movement. Altough towards the end it gets very hard to control, especially since it's all physics objects throwing each other around. Maybe nulling the radial velocity when the player picks up/drops and object could help?
The leaderboard was an unexpected cherry on top! I couldn't beat your 180m but I'm still satisfyed with my result :D
Awesome game with an amazing interpretation.