After watching this video a few times I feel like they are doing really well. To me it seems like this level currently has everything in its most basic form: Some water, Slopes, moving platforms, foiliage, lightning, pathways, few generic enemies, few basic moves. They're really at a stage in development nothing currently shown will be as is. Basically we've seen nothing but testing/exploring gameplay... And that seems to be a really good thing! This makes me believe we have actually seen NOTHING of the game so far
I am beginning to believe that this will be the Toybox++ level.