Balance/add an option to adjust the difficulty of the game

[O.J.Vodka]

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The profits from developing Gap Spring are very high now, making the game simpler. It is not very necessary for 'Geotuner' to double the profits of Gap Spring. So I think we can extend the dormancy period of the geyser to allow players to use "Geotuner" more. My suggestion is to add a difficulty option at the beginning of the game and adjust the dormancy period of the geyser. The default level is 75% of the current game level, with a maximum difficulty of 25%