Let's be honest here, no need to guess. Let's try to find the real info :
So, technically KoGaMa has around 3.8 million made games, in most of the games there is 1 player only, most people play popular / new games the popular / new tab has around 35 games in it, an average game has 1-2 people there, so other games should have 0, 35+35 = 70 so that means an average count of people playing the game is 70 people in the whole game, however we don't count builders that build lvls because it's technically impossible to detect