Firstly I want to say I really enjoyed the little intro sequence, that rare for these type of game jam, adds a nice layer of polish and makes it more memorable.
I really love the feeling and implementation of the grappling hook, probably one of the better grappling hooks I have seen in a while, which why I find it a bit unfortunate that there is a 3 seconds delay between uses.
I get why there must be a delay but perhaps it could be like a jump so once you land on ground again it instant resets. just felt that waiting 3 seconds each time slowed down the flow and 'Momentum' of the game.
The art style is nice and appealing and the atmospheric background sound was lovely.
Also quite hard but fair, and I like that there was some ability to recover once you got higher up.
Well done :)