I love 3D platformers and definitely feel there are not enough of them anymore, so this was a welcome surprise! There were some good platforming challenges here, especially with the disappearing platforms, but as others have mentioned, the floaty jump made it a little too difficult to correctly judge where you would land. I would also recommend adding an animation or sound to jumping on the clams, as I could not tell right away whether landing on them actually did anything. I also experienced a bug in the second level, in the rocky area with all the little water spouts, where I landed in a slight indent between two rocks and could not jump, as the game thought I was still falling. Overall this has a lot of potential and just needs more polish, excellent work!