Mood: The mood of this video appears to be romantic and emotive, with a focus on heartbreak or longing. The title 'Dil Gaya' translates to 'My Heart Went Away', suggesting a sense of loss or separation. The overall theme seems to be related to love and heartache.

Environment: The setting of this video appears to be a celestial or cosmic environment, with a dark blue and black background featuring stars and a glowing heart-shaped object. The atmosphere is dreamy and ethereal, suggesting a sense of otherworldliness or fantasy.