I really like this idea. I remember working through the Nand2Tetris course [0] which essentially has the same idea of letting you build a computer from scratch. The course's chip fabrication sections had a limited number of simple solutions, so designing chips really did feel more akin to solving puzzles than writing code.

One thing I'm curious about is how level progression works. Do I get standard implementations for the circuits I've previously made? Or do I have to carry my implementations with me for the rest of the game, bugs included?

[0]: https://www.nand2tetris.org/