A few suggestion for the hotbar as currently it's pretty awful.
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Should be able to drag and item to any hotkey you want. Currently if you want at hotkey one, you have to remove all proceeding items and add re-add them.
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Hotkeys for items should not decrease by one, if for example item 1 breaks.
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Have a the icon and health bar appear when item health/fuel/battery is dangerously low.
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Lantern should be a Utility that you can strap to your side.