The menu remains, but has been translated to Russian. Of note is that the Advanced Options menu lists all options as always being at Low, and they are reset to this value upon leaving. The graphics menu lists resolutions from 720p to 1080p, none of which are selectable in the startup settings. Trying to save the settings does nothing as the graphics are instead decided by a wizard before starting or after completion of the alpha. However, only 'Continue' works as Settings and Save and Quit seem to be dysfunctional. The menu is in English, and supports the mouse to an extent.
Note that the Pre-Alpha has no pause menu, instead the Escape key quits the game. Looks like this menu was also work-in-progress.? Alpha 4 finally added a proper pause menu that works. From Alphas 1 through 3, a 'hidden' pause menu can be discovered by pressing the M key while in-game.