Thanks for the comments, they are very helpful! I turned off the E prompt on purpose, because I thought players might get the hang of things by the end, but I think I should have kept it just for the reasons you mention, since it wasn't always obvious what the player should interact with. I did try to keep it as one type of interactable per stage for simplicity, but keeping the E would have been a good idea. Thanks for playing!
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The way it went away, for me, for very sudden. It was on a bath or sink and there were 2 taps to turn off, I got the prompt for one of the taps but not the other so that really threw me. It doesn't need to be an E but something that indicates that something is interactable, like an outline when they're in position or something would be really helpfu;