Thanks!
I made Them by cropping and stitching together creative commons photos with Krita while also using the threshold filter.
The Audio was very last minute, but my (Very sleep deprived!) brain went "Hey, why not make it sound like the Protagonist is slowly arriving towards their doom?" so, intensifying bell sounds.
The Gameplay on the other hand can't be solely my credit- I was using GDevelop to make this, and it has a Behaviour system- including some basic code for platformers pre-downloaded and some extra code for a double jump on the Asset store. I did code most of the rest though.