I find this mod has a good idea behind it, but for the early game it's still too hard. Eventually change the spawn are such that we get normal ressource field there?

Thanks for the feedback. Can you clarify what you mean by early game? What do you find difficult about it?

I carefully calibrated the amount of coal so that there is just barely not enough coal to use burner miners for a long time, so it is important to switch to electric miners as quickly as possible. So the difficulty is high before you switch to electric miners but that is a very short period of the game. The difficulty drops again a bit when you research filter inserters and again when you get to portable logistic robots, by which point it might be easier than the vanilla game.