yeah I was afraid it wouldn't be obvious enough how the game worked, but hoped the intro text would kinda do the job ^^'
You need to survive until the morning (the window get brighter), which is about 90s. The greener/dimer a candle, the closer a ghost is. Ghosts rush at you, briefly stopping if they blow 3 candles. You need to re-light candles as much as possible otherwise they will quickly get you.