This was a quality piece of work. The art was decent, the music was catchy, and it had all the qualities of an old GameBoy game. Like having a key for a head. Dullahan also has a good thing going for it when it uses a lesser dealt with creature of myth, the dullahan, so that gets points with me. Granted, it feels a little like a Castlevania clone, but...eh. Still good. My only issue is the lack of a proper ending. Though being part of a Jam, I can understand if there were limitations.
Overall, it was a good time and I could easily see it as a full game sometime.