Thanks, glad you liked the jump. I thought it seemed fitting somehow.
I used a voxel editor to create the level. I'm not very familiar with voxel editors so I just picked Goxel. I exported to png slices, which I loaded into unity with a modified version of the code from this Brakeys level editor video How to make a LEVEL EDITOR in Unity
I made the level in reverse, modeling out the air and flipped it when loading it.