The idea has a lot of potential! The quick switches between night and day and trying to run around finding or avoiding ghosts keeps player on their toes to make sure they survive the night but can also catch the ghosts in the day. The transitions between the music and the lighting make a such a great contrast in the presentation. I feel you could've tried adding different types of ghosts or maybe some upgrades or tools to help the player get the ghosts. At night, other than avoiding ghosts there's not much to do other than standing around so you could try adding a ghost that chases you down constantly at night.