Very impressive!!! How you modeled/animated the "trampoline" scene has me a bit puzzled, it does not look easy.
The flat trampoline mat was a 3D mesh (picture a, below) and the bottom one was an exact copy that had been pulled down at the centre (see picture b, below)
I made the top mesh the "actor" and told it to "morph" into the bottom one - which was hidden on a separate layer.
It then appears that the trampoline flexes down and back up again.
The ball is a separate "actor" following a spline "path"
The timing is not quite right...too slow and too fast at times, and there is a slight movement of the trampoline frame...but it shows the idea.