Judging from GitHub, it looks kinda dead [1]. GNUstep for Windows [2] might be a better choice (and more likely to be up to date and complete since it is still in active development) to port something from macOS. Although you may need to have some GNUstep libraries on the system to run the application (or install them alongside your application). In traditional GNUstep fashion, it is unclear from their site what exactly is needed and why and gives the impression that you need to install the entire GNUstep just to run a simple application.

[1] https://github.com/cjwl/cocotron [2] http://www.gnustep.org/windows/installer.html