Very well done graphics, audio and mechanics, although I didn't know how to use the grapple hook and was unable to determine what exactly to do at the tower as the stairs just ended halfway and jumping through a hole in the tower didn't lead to anything. More signposting and directing the player would be useful as in a 3D space its easy for the player to get lost.
Thanks for the feedback! We tried signposting with red ledges meant to show you paths of interest, such as the ledges at the top of the tower, that you need to jump to from the stairs.
However you're right that this wasn't obvious enough. We should consider that players don't know the intended path as well as we do :)