Cool game! I enjoyed the music and sound effects, swinging around felt really good and I enjoyed the puzzles you were able to create with it. My personal favorite it the pit where you have to land in the middle to re-grapple onto the end.
If you wanted to improve, I suggest making the timer text bigger, it took me a while to notice and looked super small on my laptop. I also had a problem with getting sucked into walls when grappling and having no way out accept to reset.
Overall, a fun experience and an interesting game! Check out mine if you get a chance!