It's Expedition 33 and its not even close.
It's the game that redefined an entire genre. And it did so by exposing all those old devs who continue making top town isometric turn based games that look like PS2 titles. It showed devs like Larian that you can have movie quality cinematics, acting, and cinematography for an RPG like this. It showed Square Enix that turned based RPGs can be fun, and thrilling, and deep without needing to be realtime.
It showed ND, SSM, GG, and Insomniac that you can have likeable characters do unlikeable things, and still not lose your audience. That you dont need to make every female lead a bitch or every male lead a wimp to add drama and layers to a character.
And above all, it showed every single studio that a team of 33 devs can make a generation defining game with all the fancy graphics, and production values. an industry that gate keeps new devs instead of welcoming the new generation with open arms. Here you have 30 devs straight out of college, their first job in the industry, a music composer who was found on soundcloud, all produced a title that puts every other game released this year to shame. Oh and they sold it at the price of just $45.
It is a big fuck you to everyone in the industry. It shows that the new generation of developers, gen z or young millenials are not going to let this industry die like the old Gen X and older Millenials have allowed it to.