The grapple is fun but it could be refined a bit more. It was strange to have to click twice to get sent in the direction of the Grapple. Maybe consider putting the force on Mouse Release so its a little more natural? Also consider spawning the obstacles as prefabs and then you can create various layouts that might be trickier than the random spawning so you could control the difficulty of the game better. One last thing I would do to improve the game feel is to Disable the users movement for a short bit and then Mathf.Lerp() between where the velocity of the grapple is and where the player is trying to move. There's some really great potential here!