Well, this is diabolical. Well done.
If I had any problem, it'd be that climbing ladders is like threading a needle. You can hang to the left or right side of the ladder and still go up or down with no problem, but when you get to the floor, you have to be spot on or you can't get thru. The opening to get thru floors when on, or trying to get on a ladder is annoyingly tight when the controls are normal. If you opened up the area needed to get thru the floor, it'd help tremendously.
Also, spelling errors:
-At the beginning, when he's telling about the directional indicator, he says it's in the upper "rihgt"
-At the first timed level, the last screen says it's getting "though" instead of tough.
I stopped, but I don't know what level. You might want to add the level number somewhere. Then if someone has questions, instead of "that level where the spikes are there, but you go with the keys, but not the WASD ones..." you can know it's level 12.