Holy cow, this was awesome! I didn't have time to finish it, but I loved every second I played it! Awesome art, cute dialogue, and unique controls.
Speaking of controls, there is one thing I would change. I personally can't stand it when the arrow keys are used, but the up arrow is not jump. I understand that you needed the up button to be reserved to aim the grapple... perhaps you could use WASD for movement, then independently use the Arrow Keys to directionally activate the grapple?
Just a thought. Thanks for sharing this awesome game :)