That was definitely unique and fun, I like the idea and it was done pretty well here. A few things I can think of are making it more obvious when an enemy is hurt, currently it was difficult to know if the skeletons were even taking damage or not since they took so long. Ghosts would also sometimes wiggle back and forth, could just check if they're close enough so they don't reach a center line and have a small fit. Other than that, this was well done, and I liked it. Music was nice and catchy and nostalgic in a way, great job!