What a cute little platformer game you submitted here... In particular I recognize the efforts put to the graphics - very well done.
A couple of suggestions though:
1. The obstacle being a star is fine - but I think it would be even better with something that says "danger" more than a friendly-looking star.
2. The cat's movement is too slow imo.
3. The difficulty... The tolerance for error seems to be quite slim; it's quite too hard for me. I stopped playing after some pretty hard obstacles after the first checkpoint.
4. I think looping the music so it doesn't reset when the player fails would be better than resetting the music everytime the player fails. It should be as easy as adding DontDestroyOnLoad to the object that manages the music.