You play as the person holding the flashlight. Use arrow keys to move, and space to turn on your flashlight. This gives you greater visibility. The number in the top right corner is your battery. The less you have, the weaker the light and your visibility. Use the flashlight to deflect the white dots. They will bounce around randomly. If you run out of battery, the game does not end, since you can pick up ones on the ground.
This is the basic game play, but it is still very much incomplete. The white dots will probably get replaced. There would be more things to see, like bushes. There would also be levels. Feel free to use for something of your own, just give credit!