I did have some issues with the uppercut, I had one level where I stood in place spamming uppercut for a while but then on the replay it stood still and only uppercut once at the end. I had another level where I broke a box to stand on a button behind it but on the replay it didn't break the box and just walked into it, never hitting the button. My computer is old but generally runs fine, I haven't had issues playing other games this jam.