This is mostly a suggestion post for @linda, as I know she is working on the Engineer.
Ages ago, Tom modelled a bunch of waterworks based stuff on-stream. He was water pipes, a waterwheel, etc, I would really LOSE to see this stuff get resurrected for the Engineer.
Water is in the game at the moment, but it’s pretty incidental and doesn’t actually do anything. It would be great if the Engineer made/used these to make contraptions. So you would need to channel water and build streams etc (or utilise existing ones, once someone codes streams and rivers into the game), and/or draw the water with pipes for steam. The engineer would then build gadgets using water/steam power such as catapults and moving walls and sealable doors (and even the turnip thrower, which would use the power of steam to wind up its spring for X shots as it currently does).
There’s a TON of cool stuff you could do with water/steam etc, I would love to see some of this kind of thing make its way into the game.