Finished it, even though didnt understand how and why, the water physics are weird and also I probably cheesed it (ol chfuvat n ybg bs tynff oybpxf vagb gur zvqqyr nern naq abg trggvat genccrq gurer)
I'm not sure precisely what you did, but almost certainly yes. (This is, in retrospect, not too surprising - all the cheese solutions I've seen exploit the same thing in a very rational way.)