This has very nice platforming. I enoyed the level of difficulty quite a lot. Though, I am wondering how you can reach the heart piece at the temple main room.
In the gameplay section it mentions "Doing well in specific sections of the level may reward you with alternate versions of the animations." Is this a feature in the current build? I haven't noticed anything.
Im not sure about the exact conditions, but i think the ending with the 'Zzz' icon is not necessarily related to the sleep effect. For me it triggered while I had tons of different effects active (more than can be displayed at once)