All of these comments are dumb as hell; this game is awesome - I find it gets easier towards the bottom. Especially when you get used to how the grappling hook works, it's very satisfying and feels natural.
Once you get used to the mechanics, it can almost become too easy - but this has to be some of the most satisfying climbing mechanic I have ever seen in a game. It is fun to zip around and break the game.
The climbing itself is great, the centipede is great - for what it is, it is great. It seems like this could be part of a bigger game.
Honestly, even this version of the game should be like $5. But if you were to add like 1-3 more sections to the game, maybe have the centipede change a bit through the game or add a slightly different threat - it would easily be a $10-$15 experience.
Seriously though, the climbing system alone in this game is insanely impressive and feels very good. I would easily pay $30 for a full game with these mechanics.