This is utterly phenomenal. The art style was an instance grabber for me, I really love it. The BGM and Sound effect are also super cool, the music so perfectly fits the mysterious setting.
In terms of gameplay this is an awesome puzzle game, really nice to be able to see a location, then start hunting for a way to it. Really nice in all regards.
I did find the grappling hook to be a strange control scheme - one which I had trouble adapting to, i think perhaps it might be that it rotates the character and i found that unusual to adapt to, but this wasn't a huge deal breaker, i was used to it within five minutes.
All in all, I think this is up there with games that really shine this Jam - i'm surprised more people haven't flocked to it! It's awesome. Cracking job, Team!