Upon loading the game, the menu is extremely bugged out (though still functional.) Continuing from the menu into the game shows that the game itself is incredibly bugged as a whole on the visuals.

I wasn't able to get screenshots of the mobs, but they would continuously flicker between the textures of all sorts of mobs. A villager could flicker between a whole bunch of other villager textures in just a few seconds, turn invisible, or even have a different mob's texture stretched onto it (such as a horse). This would happen with all mobs, like cows flickering to creeper textures and so on, with every mob I saw.

The screenshots below explain how everything else broke pretty well.