It took me a few tries to figure out the right sequence for the last puzzle, but I really like this concept! I don't think I've ever seen an alternate take on Sokoban, it's a very creative idea. I also didn't run into any bugs or issues, so code-wise it seems polished. The only thing I'd say is that I'd love to see more levels that can really demonstrate the crate breaking mechanics, but I saw you didn't have more time for level design. Great job, especially for tackling everything yourself!