I just played it, and I have to say, I really like the ideas here. Especially that you have to adjust your scale to different objects to be able to interact with them. That's super unique; I don't think I have seen any other jam game do that so far. I also really like the player's idle animation.
I only really have one criticism, and that's that sometimes you can walk through blocks if you are really small.
Besides that, I really enjoyed it, and I am interested to see how you expand it (if you plan to keep working on it).
For a first game, this is incredibly impressive. Good job!