Tutorial on the wall little confused me, understanding what it is telling at first glance was little hard for me, I didn't had any problems with sensitivity. I agree with other pressing the "E" button once for carrying things would be better than actively holding the "E". Stacking all those boxes was annoying because carry mechanic isn't that comfortable and like other said blocks easily fall over maybe if we tried to stack them against a wall it would be better than just stacking against nothing. Other than that ending seemed abrupt to me. I guess the idea was okay. Speed running was enjoyable nevertheless :P