love it, but the trampoline can be easily abuse to do ridiculously high jump to the point you can reach the top boundary of the level just using a single trampoline.
all you have to do is grab the trampoline then release it on the bottom of the character every time you descend, repeat this and you just do a jump that even mario will be impressed. maybe make sure the trampoline reach the ground before allowing the player to bounce out of it will solve it.
but other than that it was a great experience i love to see more on what your team can developed out of this concept.