The grappling feels very good indeed. The level design is a bit wonky but great feel for the grappling.
Sound effects, while they're low in number, are good.
It has a good base, a game can be built upon it!
Thank you for the kind words about our grappling, we focussed on this a lot to make it feel right! Level design wise, I agree completely that it could be improved a lot - we designed the levels in the last 2 hours because we had completely neglected them beforehand! D'oh! Thanks again for your feedback!