I understand that. This is a very highly rated game on Steam. Clearly, many have come across it without realizing it is, in fact, free.
Even as a developer, if Steam were to recommend this game to me, I have no way of knowing it's FOSS. Very interesting strategy. I'll give them that.
I have enough misgivings about it though that I probably won't be playing it. Feels scammy. Like they are trying to essentially release a paid game, but with the support and goodwill of the FOSS community at their disposal.
I certainly hope all of the contributing developers are getting a cut...