Full Disclosure: I was a beta tester for this game. This review is based on the version of the game I played during the beta testing process.
Leas: City of the Sun is a fantasy story of sizable length. You play as a highly skilled agent, proficient in a selected set of skills and sent on a mission in a mystical world outside, filled with strange creatures.
You have three romance options in the game, each with their own quirky and interesting personalities. I eventually picked Keo, but making a choice was certainly hard, and reading about the romances was certainly enjoyable. RO genders are determined based on your own gender and sexuality. Speaking of which, there are plenty of customization options which you would expect in a choicescript game. Along with your name, gender and skills, you can also customize your physical appearance, hair and tattoo selections.
The skill system is probably a bit of a weakness. Without giving too much away, the skill system isn't too difficult to handle, and beating checks should be pretty straightforward almost all the time. Personally, I think it could be a little harder, and this is coming from someone with a severe aversion to difficulty.
The writing and worldbuilding is solid and does a good job of conveying the fantasy world before you. The pacing is slightly on the slow side, but still reasonable for the most part. If you like fantasy and prefer a stronger focus on romance or story elements, you probably won't be disappointed here.