That’s such a nice-looking UI! It has the right amount of detail, too (enough to look appealing but not too much to the point of distraction)!

I agree with the other comments for most of the colors (gray definitely seems like steam/clean water, yellow being oil, green being an acid of some sort), but I almost see the purple pipe as leading to something mystical or supernatural, maybe it transports magic or souls?

The leaf physics look really cool!