I'm surprised there are no open source GTA 2 clones (either straight-up or just similar games of that style). The total topdown PoV with rotating sprites seems like it would be ideal for low/zero budget enthusiast projects.
For any on mac who are looking - it is available for free from Porting Kit (which is a Wine-like platform). I am assuming they can install it for free since they're some sort of side project of GOG and I presume they have the original binary from when it was released for free
So presumably anyone else with a Win system could get it from GOG (actually looks like you can get it here - https://gta.com.ua/rockstargames-classics-free-download.phtm... )
GTA2 was a LAN party favourite.