This is a cool part of the war to gamify. I like the work you did on the letters. The gameplay got repetitive very quickly. Maybe instead of moving off screen the soviets move to the center of the screen and shoots at the player. That'd up the stakes some what and add a bit of difficulty. Congrats on finishing.
Side question, im really confused how you managed to get your windows build of the game to 279mb. I work in godot and i've never managed that.