The simple graphics design hid a very shallow story with next to no suspense or any form of horror that would be considered horrifying to anyone above the age of 6.
Working on what you have? Try lengthening the game a bit and add some form of actual suspense. Running from.. what are they.. Zombie Ponies? That's not going to create a sense of horror or suspense.
You also seemed to have implemented a type of mini-quest function, finding the crank and the red gem, but you could have taken this further and made them seem larger, gave them more impact. Something along the lines of having to find the key to the door to leave the house, or finding new paths and alternate ways outside of the path you came into because it's blocked now? Experiment a bit. Play other games and find what feels good to you, and implement it in your newer games (should you still be making them)