I love the idea of the breaking platforms, it adds a unique twist to traditional platformer. I think a little more direction at the beginning would help a lot but I can understand with the time limit. One piece of feedback I have is to experiment with tuning your visuals, especially for pixel art. That would include making all of the assets on the same scale so that you have consistent pixel scaling, looking into the pixel perfect camera in Unity, and zooming out the camera a little. There's lots of little tricks that help cohesion in pixel art that would be worth looking into. Great work!