When I first tried to configure OmniSharp for Sublime with Unity I had a problem with the OmniSharpServer closing with not-responding error. After few months I figured out that although I specified the path to solution file explocitly in the project settings OmniSharp needs the workspace folder set to the whole Unity Project folder, and in my case I set it to Assets folder instead to avoid filling Go-to-anything with unnecessary files.
I think it is worth mentioning in the readme that specyfying the .sln file is not enough for OmniSharp to work properly but it needs the whole project like VS.
When I first tried to configure OmniSharp for Sublime with Unity I had a problem with the OmniSharpServer closing with not-responding error. After few months I figured out that although I specified the path to solution file explocitly in the project settings OmniSharp needs the workspace folder set to the whole Unity Project folder, and in my case I set it to Assets folder instead to avoid filling Go-to-anything with unnecessary files. I think it is worth mentioning in the readme that specyfying the .sln file is not enough for OmniSharp to work properly but it needs the whole project like VS.