Game was pretty fun for the simplicity that it was, like the apple and candy corn design, the grapple just makes every level incredibly simple and doesn't really provide much of a challenge.Once you beat the boss and collect the banana the game crashes so there may be some issues regarding that level.
Overall I would suggest maybe adding more difficult levels and adjust the power of the grapple so it can't just make you go fast as hell, also decrease player speed and jump height to make the grappler more of a requirement to pass the level.
I would currently rate this game a 5/10 as I feel it is pretty fun to play but needs a decent amount of work before it could be rated any higher