> I want a language that's as versatile as Kotlin, with the ease of use of Go

You can do that today with C# and .NET Core - initialize and build your project straight from the command line with standard tooling bundled with the language (of course .NET Core's tooling is a lot younger than Go's, and in a typical .NET environment you'd be expected to be using Visual Studio or some other IDE, and probably have to deal with legacy projects that depend on old tooling).

https://ttu.github.io/kotlin-is-like-csharp/ https://docs.microsoft.com/en-us/dotnet/core/tools/