Playerscale is the one off the top of my mind that was totally self-funded.
In addition, I could not find funding data on a few others when completing my research so not sure if self-funded or not: Alike, Loki Studios, GhostBird Software, Rondee, Ztelic
In addition, I could not find funding data on a few others when completing my research so not sure if self-funded or not: Alike, Loki Studios, GhostBird Software, Rondee, Ztelic