The full version will not be free.
Its currently available here (in early access) and when its complete we'll release on Steam for Windows, Mac and Linux.
If you have the full version can still play people with the free version though (but only 1v1 on the default map)
The current early access price [$6] will also increase as the game get more features added, and approaches completion.
We'd really like to release on Nintendo Switch, but we dont have anything planned for that yet. Probably we'll see how the Steam release goes 1st.