Algodoo

I can see that you want better aesthetics than performance. The pistons have to be boxes, and the spawner has to spawn only 1 ball. Use Scene.removeEntity(e.other) on the spawners to do this, and delete the killer ball.
You should put the killer box a bit more down (like 0.2 meters).
Anyways, it works well

And I'm working, experimenting due to the power and capacity but it is not as easy as it seems. I will now go mechanics course, my job is to repair and build engines, but here algodoo here much differently.