Thank you! I've played Mini Metro as well; I like it.
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What year was it? Also, did you try to connect all the houses (even across long distances)? Sometimes, it's a good idea to leave far-away houses alone for awhile.
EDIT: I've given it a lot of thought, and have done some more testing. I do think the load maintenance fees in 1.0.3 were too punishing. I decreased the load maintenance fees in a new version (1.0.4). My advice above still stands, though.
Placing roads would work nicely with touchscreen, but I'd have to rethink all the the other controls (e.g. SPACE to pause, ctrl-clicking, etc.) to make everything else work on such a device. Maybe in the future, though.
Right, the pathfinding actually ignores stoplights. This is because it's built on squares either being "on" or "off," while a stoplight adds a directional aspect to it. If I generalize the pathfinding to allow for directed graphs (it would be a serious generalization), then it could allow for permanently blocked stoplights and even one-way streets.