Cool game, liked the mechanics overall and design overall.
If there's something to add it'd be 2 things - 1st, would've liked some sort of bullet time for the throwing of the board as it was very hard to keep the mouse in line while the penguin was falling mid air. 2nd and I guess most important, I was never sure of the range of the grappling hook. Might be a good idea to have some sort of indicator there.
Still, great entry, keep it up!