I unfortunately haven’t put much consideration into publishing on steam, for a couple reasons.
It costs $100 to publish a stand-alone mod or game on steam, for one.
and my experience with steamworks (the developer backend of steam) on an old game of mine wasnt very pleasant. Valve should really concider redesigning the interfaces for it…..
and when I did somewhat-briefly post some of the maps on steam workshop for portal 2 in an earlier iteration of the mod, the maps had issues due to workshop’s limitations (and more specifically, the hacky workarounds for those limitations.)
there are other reasons too, but these are probably the most important ones.
I hope you can enjoy the mod nonetheless; and I hope this answers your question. :) thank you for your interest in the mod!