Very nice. You used the theme well, and it's a decent game AND you have an ending so congrats on keeping it withing your scope for the jam time.
No real complaints other than it's a bit odd you can do most things anywhere on the screen except for collecting water you have to go right to the water source which i imagine was supposed to work one way or the other and got missed.
As others have said, using height in a 2d game is pretty cool, might work a bit more obviously in 2.5D but then you'd change the look somewhat.
I think how good this is makes the things that aren't there stand out... I feel like under the simplicity of this there's probably a marketable game if you wanted to spend a chunk of time on it.