Holy shit, where do I begin. This game feels exactly like something I would play for hours on sites like miniclip or kizi back in the day. This has levels of polish that you would expect from a game that was developed over weeks or months, not 2 days. The puzzles were difficult and they really made me think about how my actions would affect the terrain and allow me to get to the next screen. It feels extremely satisfying to find the solution to each room. The concept is great as well.
The one bug I noticed a few times is being able to avoid getting crushed by movable terrain by harpooning it right at the edge and being pushed to the side instead of crushed. Usually ended up breaking the levels collision though so it isn't a reliable way to cheese a room. Overall, I would say you did an outstanding job and created a great game with cool puzzles and an awesome vibe!