Very interesting concept! I also love the graphic design in the game. I'm a huge fan of "paper textures" and that's always a style I've wanted to move toward in my games, either as just UI or maybe throughout other parts of the game.
However, I could be wrong, but I didn't feel a sense of progression in the game, like there are additional challenges or things to consider as you go on. I'd say the emotions you picked reminded me of Inside-Out, so maybe there could be progression in terms of what its like to grow up and experience new emotions. So perhaps, you start with only a few emotions and then more get added later on or something like that.
I also found it odd that Joy is the only positive emotion explored, so perhaps you could add other positive emotions/states-of-consciousness such as peace, hope, fulfillment, etc. if you choose to develop this concept further.
Overall, it was a great jam entry though!