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So good direction. My suggestion would be: Yes save feature, and there is no feedback from clicking...you are never sure your click did something. Maybe a small splash at the mousecourser or something would be nice, or a sound...

Hello, thanks for your feedback,  the only thing you can see you are clicking is top left corner at "Money P/S" whenever you click, your miner's attack speed is increased so Money P/S do too