Very nice puzzles. I've seen a few puzzle games based on scaling but this utilizes it in new ways. It utilizes your height as puzzle elements as well as object size. Getting yourself to the right size while still allowing yourself to reach the goal requires planning.
It's a bit janky but in a good way. I like that you can grow and shrink blocks repeatedly to move them.
If you plan on expanding this in the future, I recommend having some visuals to highlight the current box. Adding and outline to the boxes could work.
Overall a very solid entry especially considering that this is your first jam.