Two builder are in an empty level (1 inlet and outlet), each can be directed to move and build pipes the force the liquids from A to B.

The actual connecting of the built pipes is still rubbish and the interface is way too clicky, but in terms of the Alone side, its fundementally working, just needs puzzles and things to do.

Better piping, more intuitive ways of building the pipes is my next big thing, then a real puzzle level, then I’ll start on the Take This mechanic.