First time back after 8 months? You look fit you kept your cardio up. Like our mate who fancies the old girls above says; square shouldered is ok, if you can get onto the angles where you can use it like two fists against one then 'more control to you'. Other than that you are giving away reach by being square and you have a great reach so to utilize that more and have a more controlling jab and have intention on it would probably serve you very well, make people pay with it and use it to set up everything else off their reaction to you.
Going straight back gets you nowhere but on the ropes and if you drop slightly and widen your stance in expectation that you are to defend, then you are setting yourself in stone and an easier target and you wont get out of there as easy as you may of.
Thats an old move you did sitting into the ropes, but you were already there so it just trapped you further. That works well if they are head hunting and are determined to finish you with head shots, you pull your front foot backwards to the rear and sit down like you did, but you give yourself more room and the angle to go under their last head shot and take off out to the side under their shot with your new front foot and you help yourself under their shot with your new lead arm. That way it works because you do it before the ropes touch your back (ring sense, know where they are). and dont run stick to their outside, turn your shoulders and you are back in your original stance and catch them as they turn for you (thats where you can be a touch more square shouldered dealing with them inside and outside of their arm with your two arms.

Noticed a couple of times that when you flick a jab out you do go into a full front stance from being square and your rear arm goes out at the same time, a more advanced opponent could fake you into that again and go on an angle and left hook through your center line and take you clean off balance.