Thanks for playing! Lexan and Duran are the only two who are romanceable for the MC, and you can see their sprites on the page.
Viewing post in Nova: Synthesis Creaturum comments
Though Nova can be categorized as an otome game, romance and pursuing a relationship isn't its main focus--the focus is mainly on the plot and character development. It's not like there's a complete absence of romance from it, so I hope you will still try out the full game and see if you like it! Our team has been working hard to deliver a great visual novel and would love for you to enjoy the story/world of Nova.