Unique idea, but here are a few things I find annoying:
-Tanks, researches and upgrades not being on the same screen make it a bit annoying, especially so for early game when your water keeps draining and you have to rush between the tabs to get enough water.
-I'd prefer it if the upgrades were organised in a sort of grid formation rather than just taking up all the space in a single line. Currently it feels a bit clunky. The purchase button being on the right also feels weird, I feel like it would be better if you could just click the whole div and you'd get the upgrade.
-Clicking enter on the water tank is pretty much always better than automation (or so I've seen from my early game experience so far) which makes for some clunky balancing. As I play through more, the above issue stays apparent with cobblestone, less so with water since at some point you don't need to bother with water anymore. This also seems to be the case with some later currencies.
Nontheless, pretty good for a game within 14 days. I'd like to see the theme get elaborated further than with water and energy though.