Hey, well - Some minor suggestions could be a time limit or resource constraints.
Bigger suggestions would be lean into a factory builder type game, having random nodes across the map of various ores or resources in an endless procedural world, extracting them, assembling things with their output and piping them around. I would suggest the name infinifactory, but this is already taken... as is sky factory, mini factory, etc.
Other options would be to lean into the pipes direction more, and have to maintain multiple "work areas" that degrade over time, navigatable with the number keys. For an example of this, I just so happened to have created a similar game a long while ago: https://flyingrollercoaster.itch.io/maintainance















