Thank you for playing the game.
I am afraid that your confusion about the objective of the game is justified. This was our first game jam and we allowed ourselves to be distracted by things that were not that important for the gameplay. The idea was that one would have to stay in the air above the lava created by your weapon with the use of the grappling hook and your weapon that can shoot lava, which cools down after a few seconds and creates a platform. Unfortunately, we did not have enough time and only created the starting 'cutscene' in mere minutes (as one can easily notice ) and we did not make it so that the lava can hurt you, which is something we deeply regret. However, we learned from our mistakes and look forward to the next GMTK Game Jams :).