This is really great, I remember when I saw the first gif of the 3d mode activating in discord I was mind blown. The core mechanic reminds me a lot of Super Paper Mario, makes me wonder how we never saw a puzzle game in that 2d/3d swap style until now.
I had to give up on the second ball puzzle. I almost gave up on the first ball puzzle but I finally figured it out. For a long time I was trying to get a bounce-off-the-wall to get the ball to hit the switch twice style approach but that turned out to be a red herring, and I'm glad the physics didn't allow me to get "almost there" since that would have been more frustrating than finally realizing "ok, the ball just doesn't bounce back when hitting walls, that's just how it is."
The real approach to that first ball puzzle was definitely a great example of divergent thinking. I'm better at puzzle games where you can slowly build up a solution from less complex parts but this game demands very creative solutions, which I imagine is harder to design but leads to a bigger "aha moment", unfortunately I couldn't figure out the next level but I'm betting it requires a similar creative synthesis of all the elements that I just can't think of yet.