This is very interesting. I like C# as a language, and I like Go by its tooling. If this project goes well, it would be the best of both worlds.
The official `dotnet` command is not to my taste for a few reasons. It uses XML, and it is quite slow, e.g. a simple "Hello, world" project takes 2 seconds to launch every time. I mean, it always takes 2 seconds even after compiling everything prior to that. It might be acceptable for an interactive development environment that employes an auto-compiling workflow, but for a CLI tool, it is too much of a burden. I know Microsoft are trying to improve it, but at least up until now it hasn't been very successful.[1]