This was a lot of fun. The constant movement, the feeling of being chased by the curse, it was tense and kept my mind racing the whole time. I'd like to see a bigger version of this one, I would definitely pay a little bit of $ for that.
If I could see any sort of changes, I'd like to maybe have a more fleshed out environment. Multiple paths to do things, an explanation of the curse and the red mist that damages you, making the cathedral feel more "lived in".
Excellent job overall and I hope you keep on making games!