Found when flying away from the portal for a bit after beating the creator. I haven't seen it before. I couldn't damage it and no health bar appeared if I tried, but it could damage me if I ran into it hard enough.

I really like the inventory system, it is satisfying to use. There is a minor problem though. There doesn't seem to be a way to get a weapon back from Hogan once you toss it to him, since grow weapon and grab weapon are now the same key (E).
Also it would be nice if there was a setting to make the game automatically pause when inventory is opened.