I really like your game, looks very cool and i enjoyed my first games.
I agree with @abidibladiduda about warehouse and truckdepot. I think a truck depot should have more than 9 trucks available. It get complicated pretty fast when you want many output from a "water siphon".
Secondly, you should make UI menu in % of the screen width and height instead of a fixed value. If i want to play windowed or low resolution, the main menu is kind of buggy.
Good luck !