This is very good for your first game jam! The puzzles aren't too easy and I think you utilized all the different mechanics very well! My feedback is very specific, as I didn't find any major problems. I did see a few typos and I think having different sound effects for switching planes depending on what plane you're shifting to would also be good. Also, I felt that moving in the water was a little awkward, though it didn't hinder the gameplay that much. Overall, this was a good game!