I've played and rated your game, and I hope you don't mind me giving you come constructive criticism and feedback about it.
You've done a great job on the platform sprite art and the character sprite art, and you had some great mechanics in there! You could have something like a dotted line showing the player where the cannon ball was going to hit (but I guess that defeats the purpose of firing this cannon if you know where it's going to end up!)
I felt like the jumping needed more work, I often found myself falling down on the last level because my jump wasn't registering, and every time I complete it, the music duplicates! This can be prevented by using singletons, this might help you out
Great job on completing this for the jam! You and your cat done a great job ;)
-Amy