Great atmosphere (which is partially diminished by the typos and issues in the dialogue, lol), nice sound design, but very awkward controls. Having to switch between the mouse and keyboard to drag in pieces, rotate them or fix them is pretty difficult, as you have to alternate which hands you have on your keyboard and mouse almost constantly. This could be fixed by maybe making movement between the systems be controlled with WASD, and piece rotation and placing being done with the mouse and scroll wheel.
It also isn't clear which pipes should connect which inputs and outputs, as it seems that the entities want to go to a specific one? (they sometimes get stuck even if the pipe is connected to an output.) Simply labeling the inputs and outputs and explaining it to the player would go a long way in making this game more enjoyable. A button to skip the tutorial would also be appreciated.
Other than that, I like the visual style, and the atmosphere and gameplay are very well linked. The flaws do ruin it a bit for me, though.