Super unique and original idea. Glad someone went with the tides angle. I had the "objects falling through walls" bug as well.
I was never completely in control of the water mechanic, perhaps there was a better strategy but I ended up going very slow on most levels.
I made it to level 7 but couldn't raise the water high enough on the right side. I'm not sure if I had the wrong solution, or if I just wasn't controlling the water correctly. For a puzzle game I prefer to be left knowing I just couldn't solve it, rather than control it. :)
Amazing for a first submission though, hope you continue to refine it!