Wow I really liked this one. The art is very nice and I like running around looking for the symbols on the faucets. I think the map is the perfect size so the player is unlikely to get very lost. I was a little confused about what to do at first, but the symbols on the pews gave me at least something to go on. I don't think you need to make it obvious what the player should be doing, maybe just add a little hint at the start. I think sound cues would also be nice as someone else suggested - the player would recognize early that interacting with the faucet is actually doing something elsewhere.
To be honest though I did essentially get stuck after some time. I made all the symbols on the pews glow, and then tried to figure out what to do next but couldn't find anything. So then I made all the symbols dim and still couldn't find any next step. Maybe that's all there is? The only thing left were the 2 faucets directly outside the church which seemed to have the symbols matching the angels, but I tried turning those on and off and the angel symbols stayed dim/angels didn't do anything to my knowledge? Not quite sure but I did enjoy the gameplay.
The game was actually pretty scary to me until I realized the monster is easy to avoid, and then it just becomes a sort of area denial, which I think is fine. My only big critique is that the chirping noise in the background is grating and I'm not sure what exactly it's supposed to be.