A game where the entire movement system is based on a grappling hook is really smart. This is a really unique game, the movement was fun, and I think with some more development and polish, this could be really addicting. I love how you played with the lighting to create a spooky atmosphere that also challenges the player to be cautious with their mouse clicks.
For a 48 hour game jam, this is tremendous.
A couple thoughts for improvement, if that's OK. I think having some ambient glow or some way or hinting at where the spikes are could help. Right now, it feels like a lot of guessing and crossing your fingers you won't run into a spike. Some way of helping me discern where to click before I blindly launch myself into the darkness. Secondly, I think having some kind of way to help the player not get stuck on corners or stuck on spikes could help the movement feel super smooth. But for 48 hours, you crushed it!
Excellent work!