Some of the icons are not applied on ST3

Like this.
i had issues with icons not displaying correctly because I'd manually installed (not via package manager) and had put the theme in Packages/User rather than Packages. Once I moved it there and restarted, the icons showed up. It does seem contrary to ST3 folder structure to have it that way though.
I don't know how to do anything like that
@nornie Assuming you have Homebrew installed, you can run the following from Terminal:
brew install wget && wget https://github.com/kkga/spacegray/archive/master.zip && unzip master.zip && mv spacegray-master "$SUBLIME_SUPPORT"/Packages/Theme\ -\ Spacegray
And then from within Sublime hit CMD-, (command-comma) to open your user preferences. You'll want to add the following two lines at the end:
"theme": "Spacegray.sublime-theme",
"color_scheme": "Packages/Theme - Spacegray/base16-ocean.dark.tmTheme"
It's possible nothing will be in there, so your final settings will look like this:
{
"theme": "Spacegray.sublime-theme",
"color_scheme": "Packages/Theme - Spacegray/base16-ocean.dark.tmTheme"
}