Systems and techniques for providing feedback to users within an environment that interact with user interfaces (UIs) that are projected within the environment. For instance, the systems and techniques may project a UI that includes one or more selectable portions, such as keys, icons, sliders, dials, or any other type of control. After projecting the UI, the systems and techniques may identify the user attempting to interact with the UI. In response, the systems and techniques may provide feedback to the user indicating that the user has engaged the UI. For instance, the systems and techniques may visually alter the projected UI, may output a sound via one or more speakers within the environment, or may provide the feedback in any other manner.