go-flappybird is the fun project to get into gamedev and get to know how go-sdl2 works.
On Mac OS X, install SDL2 via Homebrew like so:
brew install sdl2{,_image,_ttf,_mixer} pkg-config
For complete guide how to install Go SDL2 see here
To install go-flappybird and its dependencies, type:
go get -u github.com/spoof/go-flappybird
go get -u github.com/golang/dep/cmd/dep
cd $GOPATH/src/github.com/spoof/go-flappybird
dep ensure
To get it run, type:
go build -o flappybird; ./flappybird