Sorry that you got stuck (you are not supposed to go in the jellyfishes pond), there are invisible walls to prevent falling but I guess I missed a few spots. It's a shame because it's just before the best 2 scenes. (you can always restart and come back here in 2 minutes, though).
To get the objects in the frame each I check if every target's collider is inside the camera frustrum, then I use a raycast to check if nothing is blocking the view. (but this system is a bit glitchy and sometimes detects objects incorrectly)