Ok game but there are some serious flaws/glitches that need to be addressed. You can fall right through the platforms unless your entire character is over it before landing. In others words you have to hit dead center. Timing with the grappling hook is frustrating due to the delay. You can also freeze after restarting because the game still has to process through the death animation even though you resetted just before dying.
If these were fixed I would give it 5.