This is super cool! Really polished and professional looking. There was a funny moment while playing where I destroyed a bunch of spikes to make a jumping section safer, taking a little bit of damage in the process, only to clear the jump effortlessly without having needed to make it safer. After a few minutes I ran into a weird glitch that caused enemies and lanterns to be invisible, and I gave up shortly after that. I'll try reloading the page to see if it was just a one off thing. If I do manage to finish the game I'll offer some more feedback. From what I did get to try out, the grappling hook was my favorite mechanic.