Quick heads up about this very promising game, scheduled for release at some point in Summer.
Compared to the Patreon version, which includes everything stable enough to be released, and the Public version which has fewer vehicles and no generated missions, the Steam demo is in-between the two. It includes a series of instant action missions is available, but no generated missions, and contains all the vehicles.
You can download the Steam demo from the GHPC Steam page.
If this is the first time you hear about this project, head over to GHPC official site FAQ. Yes, it also explains what “PC” stands for (spoiler alert, it’s not Personal Computer!).