Very cool! Feels very polished for a jam project!
Runs well, easy to understand and fun to play around with.
I am thinking of the design possibility space this recursive mechanic unlocks. Without a recursion limit, I think this corresponds to having infinite space, but just more difficult to manage.
This is a design area I've experimented in: https://ttrkaya.itch.io/zoomer with my custom engine just like yours!
In terms of game design, I couldn't find a satisfactory approach for a coherent game loop. I think your mechanic does not unlock fertile ground either on top of Shapez.
Thanks for sharing this impressive experiment! Well done!