Gunnar: It's damn confusing, though. God knows why Mamba Games have chosen to do this.
dtp released it. They're the German publisher who funded this game. Mamba Games signed a deal with them to bring the game to the English-speaking markets.
This is far from the first time dtp have released games in German-speaking markets long before they've reached the rest of the world. The weird thing is that they included an English-language option this time, which they normally don't do.
I wonder why the English-release was postponed, though. Maybe Mamba Games really wasn't happy with it, and wants further improvements before they release it?