Excelent graphics and soundtrack! I wasn't sure if it was a bug or a feature the fact that when you sacrifice a pumpkin if the player pumpkin is below the sacrificed one when it is falling, the sacrificed pumpkin will stop in midair and stay there. If it's a feature that I would recommend more information in regards to this.
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I'm not sure to be honest. Usually puzzle games have a level that is just designed to teach you a mechanic. If you make a level like the fist one where you need a step stool to get to a higher area and the respawn is close to that but it cannot be reached by just leaving the pumpkin on the floor, I think it would suffice. You also should add some sort of effect like a magical particle floor to pumpkins in the air like that because without it, a player like me might think that it's a bug.