I hate the controls. Mostly what I hate is how the camera follows around the mouse, and there is no way to disable this. It make place bricks harder. And the is no delete button other than ctr+z?

Do you have any suggestions for improvements? I don't understand what you mean by "camera follows around the mouse". How else would it work, if the camera wasn't controlled with the mouse?

You can undo up to 15 steps or use the left mouse button the same as if you were creating blocks.