Hi PIN, add me on discord (same name as here) and I'll send you the server invite! Or you can join the link on my Patreon 'About' page: Arcane Pengi.
I won't be adding custom characters to this game due to how much work it would be, but I can add it as a suggestion to the sequel!
There will be a Steam and itch version for sale next year once the game is completed, but it will need a bit more time until it's done 🙏