Oh wow. Another grappling hook game. How original.
No in all seriousness, I really love the concept but I also really regret the execution. It's super foddian and I love it but the hook's cooldown kills any momentum. I think you should have done away with it entirely.
In some comment you explain that you wanted to avoid chain grapples to climb walls, but that would have been super fun to do, especially if you gain speed every time you grapple correctly. When you go fast enough the little platforms become obstacles rather than helpful checkpoints so you wouldn't need to change much I think. Also you could simply put some kind of clearly identifiable dirt on the walls on which the hook can't stick so one cannot simply rely on the walls.
I couldn't get very far so I don't know if you did this, but tilted slippery platforms would be fun too.
Loved your entry and that they didn't send a drone instead because then they wouldn't have a game XD