It was my first time trying to build a good learning / difficulty curve, each level was changed many times and i learn a lot about the difference between the player vision and the vision of the builder. It taugh me how to modify and move some blocks to lead the player or make the player think a certain way.

It also greatly improve my patience aswell as my way of building things. Take the habbit to take some distance to see if it works, change and check again, etc.