This one is a pretty interesting challenger! As others mentioned, it's quite surprising, and the gameplay past the painting scene is also a bit hard to understand. To understand how to win the "smile" scene I had to check the source code and find what triggers a success condition, as just click the mouth and eyebrows to make a smiling face was not enough...
The conclusion is a bit weird too, I had hopes for some bigger reflections on human emotions, with some gameplay mechanisms that would make me find out something about my own emotions. But I know that it is only a prototype, and I do hope that you plan to continue working on it as it might become something very interesting.