BEFORE I PLAY YOUR GAME:
I am assuming it is this, Nightmare in San Vicente, correct?
Before playing it, I will say this: itch.io - the administration and website - wants itch.io to be a "real" store. So, for them, there is no such thing as "too long."
Since you said in one of your devlogs that you wanted to eventually release a downloadable paid version, 14 hours is not a bad length. It may even help people think they are getting their money's worth.