The game window size is 854x510, less than a quarter of 1080p. How do I resize or switch to full screen?

Anyone know how to get this to run on Linux using Steam Play?

I hope it's still coming out.

According to wikipedia, an otome game, sometimes contracted to otoge, is a story-based video game that is targeted towards women. Generally one of the goals, besides the main plot goal, is to develop a romantic relationship primarily between the female player character and one of several traditionally male characters. This genre is most established in Japan, and is mostly made up of visual novels and simulation games; particularly dating sims and life simulation games. This game appears to be a visual nov...