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It doesn't make GUI's for OSX just yet, and I'll be interested to see if it stays that small once OSX and Linux support are added.

EDIT: The version on their download page doesn't make GUI's for OSX yet, but there seem to be other versions that do.

Check the progress in https://trello.com/c/UgsrhiHf/143-macosx-gui-backend 107 out of 120 tasks for OSX GUI backend are already completed.

Here is a under 700k alpha preview GUI binary for the Mac (circa July 2016) - http://static.red-lang.org/dl/mac/red-console