Press "E" or click the text, to hide/unhide the HUD, collect some of the potatoes by clicking them until health reaches 0, when it does you earn $ and you can purchase upgrades! If you need some hints, there is a help tab in the HUD that will explain some of the mechanics! I hope this helped, if not please comment again and we will try to help as best as possible.
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hi freak132, don't forget claiming your fee(reset) frequently and also using your upgrades is important to see a quick progress :)