Really cool core mechanic. The matryoshka mechanic goes really well with the theme. My game also is a bit inspired by Matryoshka dolls(esp. the ending) haha. Feel free to check it out.
Puzzles ramp up quickly in difficulty but are managable. I had to really think to solve the later ones.
The graphics are a perfect fir for the game. My only suggestion would be to make switches more visually distinct. I did not notice that the white pedestal looking thing was a switch. Both the pressable part and the switch base were white and blended together since the model was so small. You could use a different material for the base.
The soundscape is very relaxing. It it the perfect chill vibes for a relaxing puzzle game.
Can't believe this was done in 48h. Excellent job!