Overall, a fun game to check out. I liked the varied theme of the final level vs the first three, the game controlled really well, also the difficulty of the levels was also pretty solid, if not a bit tricky at times (the start of level 2 feels EXTREMELY tight and I failed it a lot of times). If there would be one thing I'd add it would be some sort of indicator of the area you can use your grapple hook in, since it's difficult to tell how far away you can actually use it and that lead to many deaths when I thought I should be in range and then I was not.
Definitely a fun game, good job on submitting this!