Theme troubleshooting

So I spent the last hour or so brainstorming how I'm going to do this thing, and trying to come up with something that'll both fit the theme, and work within the only-use-Kenney.nl-graphics constraint that I seem to have set myself.

Here's what I've got so far, it looks like the industrial theme is the go, based on the number of ideas it triggered, but feel free to steal the other ideas :D

The theme is flow, so the first step is to go look at kenney.nl (https://kenney.nl/assets?q=2d) and think about the sorts of games I can make, and how I'm going to do this whole thing.

Wishlist:

Thoughts on the theme/graphics:

Some sort of thing with pipes?

Or perhaps holding back a tide or river to save a town from flooding? (https://kenney.nl/assets/map-pack, or the platformer town one?)

Population or animal management?

Perhaps a permaculture/ecosystem simulation game? :o
Platformer industrial pack (https://kenney.nl/assets/platformer-pack-industrial) could work (not included in platformer complete pack?)

Workflow: