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This is a really good concept, it is not a new idea to have multiple worlds the player can transition between (Giana Sisters: Twisted Dreams, did it in a similar way), however the way you have implemented it is really good and with your own style and the two worlds contrasting against each other work well.  For the future think about ways where you can really show the difference between the worlds, the spike bit is really good but is the only standout moment.