It's just another form of GOL, or Game of Life.

If you mouse over MOVE, it tells you "B368/S245". This means that if there are 3, 6, or 8 pixels of MOVE around an empty cell, it turns the cell into another particle of MOVE. Also, if there are 2, 4, or 5 pixels of MOVE around another particle of MOVE, that particle stays alive. Otherwise, it turns into an empty pixel.

I would try playing with GOL first (right-most in the category), because it is easier to understand. For more information, check out https://en.wikipedia.org/wiki/Conway%27s_Game_of_Life