The best way to know someone's opinion about a movie is by capturing their reactions all along the movie. It's true that The Happy Film's purpose is not to "make you happy" but it truly does give you a warm feeling of safeness and happiness. It touches a big part of us and leaves us with so many challenges to deal with.
There were tears, laughs and sadness. Learning from someone like Stefan, whom I truly admire, opened up our soul and mind through this movie.
You may get lost in between because you're caught up by the honest moments that have been shared or caught up by your own thoughts thinking about your conflicts now. But that's the beauty of the exercise.
Congratulations on this masterpiece, I would watch it again and again and still learn something new every single time.