I just finished all routes a few minutes ago, but I won't spoil anything.
I am also a giant coward with horror, so have heart. If you've gotten through the first two, you can get through the last one just as well. It's genuinely worth it and will be an entertaining ending for the game as a whole. You can do it!
Also, check out the three '1000 Download Celebration' posts in the Dev Logs for each of the routes. They have short story epilogues for each route (with extra art) that's super worth reading.