thanks for playing! Yeah, the water has a hidden collision that is only a few tiles wide that tracks the player - you must have just fallen past it?! I'll add that as a bug - just increase the hidden collision - thanks for the bug report!
The controls are a little pixel-perfect-jumping.. I may remodel the level to reduce the pinch-points!!
Do try it on other hardware... on GB Pocket and 3DS it's very cool!