I'm a win.
Pipe could be a gun, maybe it's because of portal vibe I picked, but it really felt like pipe should be a gun.
Being fluid simulator I thought that low tank won't be able to feed high tank, if you're leaning into realistic simulator angle I think it'd be good to either move it up or create some sort of pressurized tank mechanic
I think color coding needs to be changed to more common - red off / green on for instance,
To summarize, cool mechanics.