Revenue sharing agreement for games made by a small team

Sorry again for posting in english but I don't know french and a friend of mine told me about this place so, it seemed like the only place where I can get some actual help hopefully.

I'm a software developer and I've met this french guy online, we seem to get along well, and after a while decided to collaborate and make a game together, they are an artist so they are doing all the art, and I'll be doing all the programming for the game. We eventually want to make money off this game and agreed to split the money 50/50 but I told him that we should get into a legally binding agreement before doing anything serious since, I don't want to work for months just to argue over this and then have to drop the project as a whole.

They claim that we can't just simply do a 50/50 revenue sharing agreement because the laws around IP are quite "strict" in France and because of the "socialist laws in France" they'd still have to pay me something even if we make no money? I stated that that is not necessary and that we can just state in the revenue sharing contract that neither of us would expect a guaranteed minimum payment, but he says that wouldn't work.

He offered me three options and neither of them seems ideal but here is all there:

1. We co-create a company, but he mentioned something about one person drowning other person's share's by investing so much, i don't know what that really entails or if it's possible in a privately owned company but seems scary.
2. I open source the game code before release, and he pays me from the money we earned, but this feels like I have no legal security or right over the work I'll be doing.
3. Or I can state that the code I wrote is a personal project as a student and, sell him exclusive rights to edit or modify the code for 50% royalties.

So my question is are any of these options are a good or even necessary can't we really just get into a revenue sharing agreement under french law "because of the socialist laws"?