Great platformer ! Was happy to see that the water was, again, our beloved sprite :'D
Would've loved some sound or a oxygen bar ! Great first entry by the way =)
i mean its my first entry on gwj but i've been making games consistently for like 2 years now.
And about the timer. I considered it, but personally don't think the games needs it. You are already in a hurry cause you gotta get to the end before the water rises, so adding a timer would just be an anoyance.