Fun little concept. I think empty churches are naturally creepy so that worked great. The slow buildup of scares definitely built some nice tension as well. I just don't think the ending was a hit for me though. It was too sudden and didn't quite fit in with the rest of the game in my opinion.
Suggestions:
-Add a unique task for each night to spice things up. In addition to Chairs/Lights, maybe add in "Clean Pews" or "Put Away Bibles" on certain nights.
-Maybe a little lore that builds up the end scare with a note or something, so it makes a bit more sense.
-Tone down the VHS effects. They were so heavy in this that it was hard to really appreciate the building and even read the text in game at first.