If I understand the instructions correctly and you need ctrl + click to connect pieces, that is going to be a problem on MacOS. Since on MacOS ctrl + click == right mouse button.
I, at least, can't get the trackpad to work. I can place the gate but have no way of connecting it to anything. I don't have a mouse to test if that works.
EDIT: This might be my mistake - I am using a mouse, not the trackpad (hate the thing) - so that might be a different experience?