Such a cute game omg!! And especially as a solo dev, I think it turned out great. The Chrome Music Lab music reminds me of when I first started making music, and it was lowkey fire, and the art style was very simple, yet charming. There is one very minor thing you might be able to do to improve the game. I felt a little annoyed having to reset the position of the spinning platforms each time I died, so maybe having a way to keep them in their position, instead of having it restart to the beginning, would be beneficial. (Especially in the later levels with 3+ platforms needing to be aligned very specifically)
Overall, you did a great job for a first game jam, and I enjoyed my gaming experience!!