As a test, I cheated my way into the
Fractelephant room where you get the double jump powerup
and nothing stopped me or looked out of place at all. I think your system's broken.
As for the level, it was alright. Not great, but alright. Several of the areas seemed pretty sparse, like the Blocklands (to the immediate
right left of the starting point) and the starting area itself. The areas also didn't really flow into each other for the most part (e.g. a snowy field leading into a farm, not to mention everything connected to the place with the Spectrum Blocks tileset), but other than that, it was fairly good.