These hidden draggables require minimal observation(but it's always observation),they can be easily viewed,and I also think that this is how hidden stuff should be used. (nGord please don't use these words against me)
Bufff finally solved, I don't remember the number of times I tried it but finally... I think it is one of the best remakes of the official level 1. Thanks!
Excellent logic level with some hidden elements...I love the storyline...Great job and thanks for sharing @meko