Nice. I like the graphics and the audio for the game. The core mechanic of the grappling hook felt fun and good to use. I seem to fall through platforms often when trying to jump on them. Especially since this game emphasises platforming quite a bit, it was a little frustrating. In general, feels like it could use some branching paths to add some metroidvania it, but I'm sure that was time related.
Overall, nice job!