I made it through on my first try and got the "Proud of You" ending! I tried playing a several more times without killing any souls to see what other endings there were, too. Unfortunately I kept dying at the jumping segment or right before. FPS platforming is difficult to nail, maybe slightly larger platforms would remedy that a bit?
The aesthetic was really nice though. It felt like an old school dungeon crawler with that low ceiling and pixel art textures. I also liked the music. It really contributed to the atmosphere!