The Rabbit and The Owl is now 1 week old on Steam! Thanks to everyone who has played the game so far and for all the kind words about the experience of the full game :)
It has come to my attention that there is an unofficial workaround to playing online co-op with friends. It is not anything implemented natively, but basically you can use this really amazing application called Parsec.
Essentially, it lets one person host the game locally and share their screen with other players online. Their input devices are seamlessly integrated into the host's computer so you can play the game as if you were connected to the host's computer directly. There's very little latency as long as everyone's Internet is good.
I was able to test this successfully with both the 1 controller + 1 keyboard setup and the 2 controller setup for co-op.
I've seen this application being used for games like Enter the Gungeon and Sausage Sports Club -- games that do not inherently have online co-op but use this as a workaround. I just caution that I do not officially support it and give no guarantees that it'll work well for you.
Anyways, just thought you all should know that this is a possible option!