Oh, wow, was not expecting that ending, that was very well executed. This is a fun game, my main issue would be the strange way the camera pans, or should I say, doesn't pan up or down until you "exit" the camera view, hope I'm explaining myself. Makes it feel like I am taking some leaps of faith dropping down some parts of the level, althought now that I think about it I don't think there are any bottomless pits in this game.
The jack'o lanterns enemies were a very fun idea I think, also, I like the way you framed this as being a "restored" old classic in the itchio page. Now that I think about it, that should have given me a clue as to what you were going for with that ending.