Really fun core loop.
The engineering puzzle paired with incremental style progression is a smart approach.
I struggled a little with understanding how/why to use stuff that wasn't just level geometry, accelerators, and turbines.
It was easy to see what direction the fluid was flowing, so that made solving problems with geometry really easy to understand, but understanding how pressure / velocity were affecting flow rate, or even what the overall flow rate was, seemed very opaque.
Even still I had a lot of fun with it, but I did come away with the impression that I'd only really experienced a fraction of the gameplay because I could never really figure out how to use the compressors/splitters/duplicators properly.