Hey, thanks for checking out the project! I did actually try at one point to emulate the physics from SMW exactly, but I found that when translated to 3D it made Mario a bit difficult to control.
In the original SMW the gravity is pretty strong and Mario falls quite fast after jumping. When I tried translating this into 3D I found that I miscalculated my jumps a lot, and ended up dying instead of landing on top of enemies. In the end I decided to tweak the controls a little bit to what I felt better suited a 3D environment. That said, I might have another look at Super Mario 3D World at some point to see how they did it in that game and possibly tweak the movement a bit based on that.
Thanks again for checking it out!