This was fun! I got three different endings–are there more? :)
All I have is a note that reversing the clock doesn’t tell you how long it takes until after you click.
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Whoops! You're right. I won't fix that right now because of the prominent "NO UPDATES!" rule for La Petite Mort entries, but it might be something to tackle after the comp (and in case it helps anybody else reading this, reversing the clock takes half an hour).
There are actually more than three different endings, though you've probably found the main ones! There are a couple that trigger if you have a particularly unusual spookiness score that are probably easy to miss.