Mini Motorways, the successor to Mini Metro by Dinosaur Polo Club is finally available on Steam for both Windows and Mac, with a 10% launch special bringing the price down to $13.05 until 27 July 2021.
I've been playing this title on Apple Arcade (and this was a key factor in me extending my subscription) so it's great for this title to be breaking out of the exclusivity agreement. It has very similar vibes to Mini Metro but is more focused on traffic management (motorways, bridges, traffic lights, etc). Highly recommended.
There's also a discount on the combo pack with Mini Metro as well for $22.04 (24% discount).
Note: If you already have an Apple Arcade subscription, Mini Motorways is available on all Apple devices (ie iPhone, iPad, Apple TV and Mac OS). I haven't tried the Apple TV version but the Mac OS version works well.