Ah ha ! The Ghost Busters vibe is there !!
The music is awesome. The graphics are also incrediblely well painted! I love the controls where the bros are back to back.
However first the ghost is not affected by the lighting idk if its intended but the ghost looks really "not into" the atmosphere. Second, the gameplay started to get bored overtime. If more mechanics are made the game will be more fun. For example more guns could be made. Maybe a dash or slide mechanic. Also the vacuum cleaner is unplugged. You can improve the graphics by creating a line to "plug" the vacuum cleaner in order to charge instead of picking up energys xD just saying but over all a decent game. I would love to see it become a mini game with more mechanic, maps and hopefully multiplayer pvp .
Also nice intro. Your pixelart skills are god.