I have a lot of fun. I several times had to restart climbing and at the last minutes of the struggle I started to shake because of stress and pressure due to the possibility of falling all the way down. There is no possibility of restarting from a saved point because you have no way to die although you save. May be its better to put a laser or hazard water to enable the player die. Otherwise some of the players may get bored and give up playing.
Anyway my final comment is: very good.