It's a very nice game to be made in less than 72 hours. The concept is great and the graphics are awesome. I am agree with "LucasMZ" who said that it needs some kind of power up, so it has a little variation (I would add a super charge that makes your arrow not to collide with any platform except the final one).
I found two bugs:
-Half of the player can go out of the screen. You can easy validate that making the X - Width/2 not to be less than 0 and X+Width/2 not to be more than the size of the screen.
-The character bugged loading the arrow and kept loading infinitely, disabling my movement until the time runs out and I die.
Great game. I wish you keep working on this. Maybe a linear game in which you can move arround scenes. I don't know.