This has a lot of potential, but there's a lot you need to work on. variety in line thickness, cleaner lines, shading, and more interesting backgrounds were some of the first things that came to mind. also that scribble that goes over the characters head that supposed to be hair drives me bonkers, make the line thinner or make the hair overlap his face, it looks like a 3 year old scribbled on him with marker. whenever you do frame by frame animation it actually looks pretty bouncy and cool so I would focus on getting better with that to make that part shine more, on that note, especially near the beginning there was some lazy ass tweens that made me cringe. so avoid using tweens unless they are necessary. your characters are kind of one note and boring, make them human, for example the ghost is always cynical, the character has to show more then just that or they will be flat and uninteresting. anyways, those were my thoughts, keep try'n and I'll keep an eye out for the next episode.