The game has a nice menu with sounds, it can be prettier with a little more graphic design (i think the colors and the background are a little bit chaotic).
Being able to jump at only specific locations is brilliant, the last level i think had a short cut so the ending was anti climatic... anyway, good game, collisions and the player's speed need a little more work.
Lastly, having a bell ring doesn't cut it to fit the jam's theme, for me it has to be relevant to the gameplay/mechanics or at least to the story.