An interesting prototype, it can offer some interesting puzzles, and even the fact that it's always you, but younger, who reverses gravity, can lead to some nice moral storytelling.
The main problem I encountered is that the buttons, despite being red, are not very visible. Maybe you could make them just a little taller and see how it turns out.
Another thing, but I don't know if it's a bug or intentional, when I turned into a child and the boxes became balloons, I saw one that was horizontal and not vertical like the others. I think it was due to the rotation of the box I had overturned, but it looked strange. If it doesn't use some kind of mechanics, I would reset the rotation to prevent the balloons from being crooked when you transform (if it's already there, I found a bug, sorry).