Force LoDPI (non-retina) apps to run at the real resolution

A Mac does a lot of things well, yet gaming might be sometimes a bit finicky, due to developer support. One example is the games on Steam that don't natively support Retina. They start up, and the pixels are just doubled. I am thankful it uses nearest neighbor, rather than linear interpolation or other such methods. Still, this is not quite what I'd like to see. Games either scale the UI automatically or have UI scale settings, so doubling the resolution would not be any issue visibility-wise. What is an issue is changing the display resolution every time, be it from the settings, or via some third-party app. The cursor becomes smaller and moves at a different speed and UI elements outside the app become smaller as well, which is to be expected, but not desired. What I am looking for is if there is a way to make individual apps work unscaled, basically show them as if they were Retina-ready, equivalent to turning scaling off on Windows by checking that “let the app do the scaling” box on right-click. I hope that there is maybe a .plist or a terminal command I can run to make any arbitrary .app behave like that. Or maybe a Steam launch argument, which I doubt. Or even some third-party app that can trick applications into believing the display has a different resolution. Games that come to mind are Terraria, Besiege and Ancient Aliens (the weird History Channel game), but I am sure more of them suffer from this issue. Edit: I have found an app called Retinizer. It is very old, and the original website no longer exists, but there is a mirror on CNET and it works just fine... for regular GUI apps, but not for games.