many times there are no gradual intensities of volume, but more treated as 'volume terraces' or levels...
At some point, try checking out the Ligeti etudes...
Firstly, I think that your interpretation lacks a bit of gusto and playfulness.
The second thing I thought about is the section starting about 50 seconds in. As I said before, I think the playfulness is missing here. i would use a little less pedal and also think more about the base line, which is quite important in my opinion. Also, why did you ignore those little fortissimo outbursts? I think it's important to use that sudden fortissimo there, because that will also add to the playfulness.
Have you played the other movements?
I agree. Do you have advice for how to make that happen?