tween.all(a, b, …) joins several tweens into one. Each keeps its own destination, duration and delay; the group's onEnd runs once, when the last of them ends.
It is declared once and played as many times as you like: played again, every coin goes back to where the first drop found it. Its pause, resume, stop, finish and reset act on all of them; the coins inside it are played by the group, not one by one.
Click the preview first so it hears the keyboard. Space drops the coins (again, from the top), X stops them where they are, F finishes them all and R puts them back up.