Great.
Overall, it was a good game. But there are some things that can be improved upon:
1. The glitch that occurs when you jump off the left/right side of the screen.
2. The fact that the water moves too slowly. You could possibly have it so that there is a burst of water every 3 secs, then 2.9 secs, then 2.8 secs, etc., to make for a more interesting game.
3. Under certain conditions, after coming into contact with the water, and the player shrinking, the game does not go to the death screen, but rather the character reverts to its regular size and the game continues.
4. Maybe adding some bonuses can make the game a bit more interesting. After every gush of water, a bonus can appear on the screen for a certain amount of time. The bonuses can be extra points, imperviousness to water, higher jumps, slowed-down time, etc.
5. The artwork as it was a great, especially the water, but maybe you should add the ocean slightly below the platforms, and have there be a discernable water/horizon-line.
6. Maybe after a set time (30 secs or so) lightning could appear -- not only the surges of water to add another element of complexity to the game.
7. You could have more difficulty levels - easy is three platforms with one surge of water at a time, medium is four platforms with two surges of water at a time, and hard is five platforms with three surges of water at a time. The four platforms could be arranged as if they were the verticies of a rhombus so that two and only two platforms could be jumped on from any given plat more. The five platforms could be arranged as in a rhombus with a platform at its center so that three platforms could be jumped on from any given point.
Anyway, great game overall. 4/5.