Exactly what Mr.Kitkat said: really good idea for a game. It has a lot of potential, and I'm gonna lay down some ideas for you. Feel free to incorporate them into any future update for the game:
- Have smaller, temporary torches placed around levels, and have your OneLight light them up with the click of a button
- Ghosts which react faster once they're out of OneLight's range
- Have different types of light to repel different types of enemies
- If you're adding more enemies, it would only be fair to incorporate some kind of health bar into the game (like three hits and you're dead?)
- Maybe a jump mechanic to overcome small pits? Adding to the spike hazard
Overall, great job! I'll follow you to be aware of any updates you make on the game. Keep at it! :)