The mixture between 2D and 3D was quite refreshing, and I am impressed with how you program this dynamic in 48 hours. That within itself is a round of applause! As for how it fits the theme, I think it checks out as you connect two separate game worlds: 2D and 3D.
As for critiques:
- The lighting of this game is too bright for my eyes. Maybe the lighting was used to cast a shadow to help players where they are landing but an adjustment would be nice.
- For the most part, I enjoy the mechanics (love the detail touch that you jump higher in 2D). However, I had a bit of trouble jumping between two platforms vertically in the 3D World. I couldn't make much progress through that section as I would either jump too early or jump over the platform entirely.
Conclusion: Great job!