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Virtual reality (VR) is a promising tool to promote mental health support for depressed and healthy populations. However, in current VR-based therapy, most users visualize on computer or smartphone screens, which lack depth cues (2D screen). The 2D screen may add cognitive load, reducing VR usability, especially in users suffering from mental health issues such as depression. These 2D screens might further reduce the therapy outcomes if they affect users' situation awareness (SA) and engagement. Many mental health professionals are not fully aware of the benefits or potential applications of immersive VR therapy. This study aims to evaluate the potential benefits of more immersive technologies, such as VR, using head-mounted displays (HMDs). As a first step towards potential clinical implementation, we ran an experiment with 21 healthy participants who performed a 3D reaching and cutting fruit task using: (1) a VR HMD, and (2) a 2D screen. Pupil diameter, fixation, saccade duration, and saccade amplitude data were collected. Pupil diameter results showed that the VR environment can mitigate the impact of high task difficulty on participants' cognitive workload (CWL). Fixation and saccade results indicated that participants could tentatively maintain consistent levels of SA and engagement within the VR environment, regardless of task difficulty. These findings suggest that VR holds promise as a therapeutic platform for alleviating CWL and maintaining engagement compared to 2D screens.