Very interesting kind of puzzle game! I love the freedom that you've given us in how we want to make the piles. Awesome work!
p.s. I saw your thread that you wanted some feedback so I have some thoughts.
1. I think the controls could be simplifed further by merging the extendo arm and the mouse click. Since there's no real difference, I was just pressing Q to pick up objects near and far. Also, maybe set the angle and power of a throw with just the mouse position rather than both mouse and spacebar. That'll make it easier to get precision shots.
2. Sometimes, objects pile on top the object I'm holding when I move, and no matter how much force I put in, I can't launch the object. So maybe have the throw ignore them, or pass on the momentum to the other objects too.
3. The character moves a bit slow, even when not holding an item. This kinda made it hard to get around.
4. This is a small one, but the character was a bit hard to see on some backgrounds, since they're grey.
But overall, you made a fun game and I think the level progression was nice. I'd really like to play more if you ever expand on it.