Ray of Sunshine
Massive congratulations on completing your book. Also, I read somewhere that English isn't your first language, so for that alone, kudos - what an amazing achievement.
Read the story now
Regarding your story, I loved the allegory of Dark and Ray for a novel titled 'Ray of Sunshine' - I find it to be an evocative and poetic touch and very appropriate for a Romance novel. Your heart-warming romantic plot has some leg, but I would highly recommend conducting a 'manuscript assessment'. If you can't pay for a professional one, perhaps ask an English teacher or well-read friend to give you detailed feedback on your plot, subplots, characterization, pace and writing. I'd also recommend a line-editing (either from a professional or bookish native speaker) prior to publication. Someone recommended Grammarly, and I believe that'd make for a great first step, but I think you'd benefit from a 'human' editing-eye.
I didn't read your novel in its entirety, but I would happily go back to it once polished. Please don't hesitate to nudge me once you've reached that stage and I'll gladly update my review.