I really enjoyed this, it's very satisfying when you complete a puzzle, while not being too difficult.
The first one was challenging but over time I developed a strategy to slowly put everything into place.
(I found the Bird (first one) to be the most difficult, and the jellyfish (last one) to be the easiest, although it might just be because I improved with each one). Would like to see more added, maybe with another mechanic to mix it up a bit
Overall, a great submission!