Can't go too far
It's not a very good game to start with, but if you reach the end of the map where the big black thing is, the map resets but the tentacles are nowhere to be seen. So your score keeps going up and up with no way to end the game. I got to 5 billion points before getting bored and restarting. I think my current 120 million is probably the highest score that can be submitted, or else extremely close to it.