This is quite a fun game. reminds me of penny's big breakaway with how it's grapple mechanic works. I think one excellent improvement that could have made the game feel a little better would be if I could keep holding left click after shooting to grapple rather than needing to let go and click again but I can see why its like that for setting up grapples in the later levels.
Last level was certainly a challenge but it was really fun and rewarding when I got the timing just right. (certainly helped that I've already played games with a similar mechanic.)