I think my biggest issue is I'm not told what the mechanics are. For instance, there's no tutorial in level 1 telling me what the controls are. Dropping the player and having them figure out how your game works is not something I would bet on. I recommend teaching them how to use the grapple hook properly, and what objects they can interact with.
Level 1 was pretty fun. Level 2, however, was confusing to navigate. I was able to grapple onto objects, through a wall (I'm not sure if that's a bug).
The soundtracks and the artwork are great though.