I liked this game. You managed to find a decent balance between control and chaos. It was challenging but not impossible. The level design is quite well, as is the gradual increase in difficulty.

The level that I found the most challenging was the 5th. After a minute of trying, I gave up on the boat and started splashing the water on the other side of the level to push it towards the boat, which then started going up. I also liked this level quite a bit better than most other levels because it needed me to shift my focus away from the player character and think carefully about the level and the mechanics of the water. 

I still don't know how I managed to beat the 6th level, or if there was some specific strategy - I tried a few things like splashing the waterfalls and trying to control them, but it did not work, so I ended up forcing the boat straight through the waterfalls.

Overall, It was fun, and if you make a post jam version, you could polish the game further, add more sprites, audio, and more levels. Nice work!