This game is very interesting and enjoyable. I understand that the occasional display of Russian will be handled in a future update. That I know a little Russian and can read Russian helps a little.
I found the dialog a little distracting when the character actions were unnecessarily described. An example is like "Welt replied" or something similar.
In a visual novel, it would be more immersive if you just let the characters act. Rather than saying "Lexi gave a sultry grin" actually have her grin.
Finally, a combat tutorial would be very welcome. Maybe you're trying to make the player feel Welt's confusion. If so, don't change a thing, it's working as designed.
I'm looking forward to the next version!