Solid entry. The music is nice and although the graphics aren't great, they're suitable for the type of game. I really like the idea of the gameplay and think it could be really fun but the grappling needs to be more forgiving and easier to do. As it is, you need to not only click on the block but on a certain part it seems or you won't fire the grappling hook towards it. This is especially frustrating when you're falling really fast and it's not helped by the fact that you respawn falling at a high speed as well. You should be able to grapple onto the blocks just by aiming in their general direction and you should respawn on a platform that disappears after a short while rather than just continuously falling.
Nevertheless, this is a good attempt. Good job! :)