Yea maybe something wrong on my side, but if I am sliding on the wall and let go of the keys, I think the fall may be too fast. I felt like the wall sliding stopped completely when the keys were released, and sometimes made me fall to a prior area. Then the prior area checkpoint re-activated, and I had to redo the entire thing again ahah. I didn't know you coded it like that, it felt more like if you don't press A|D you won't be able to wall climb at all, and the requirement of pressing/or holding on to an extra key during a difficult jump adds yet another layer of difficulty. The way Mario does it, if I remember correctly, is you can release it, but you will still be sliding slowly. In this game, if you let go you fall back down pretty fast.