Cool idea and I liked the narrative behind it. It's your first game jam so I don't want to be too harsh, but I would definitely focus on getting that core primary gameplay loop feeling super smooth. The grappling felt fun, but the movement was tricky and unforgiving, and when the level is mostly void it meant I didn't want to risk too much, so I didn't engage much with the secondary mechanics. I love these kinds of games though so I did have a blast trying to fly around the map, it definitely worked well.
Good stuff, keep it up!