Easy to download and start up. I put it on my laptop for one of my younger sisters to play. (She's 18, so it's not weird or anything, although I was definitely glad the description was accurate and the game never became salacious, because she would have been suuuper unhappy if that happened.) Although I'm not interested in romance or, uh, the activities leading up to and/or including procreation, I gave the game a whirl after she finished playing everything, trying out the Diluc and Zhongli sections.
If this seems like the sort of game you might like, I think you should try it out. It won't take long to play, and it's well constructed for what it is.
While it's not a type of story I'm interested in, and the gameplay itself is simple, I was genuinely impressed with the technical level of this fan-game, especially one which was apparently made quite quickly! I've spent the last year working on a visual novel of my own, so I know a bit about Ren'Py, and I really liked this format.
—The screen where you click on which guy you want to talk to was great, I loved how the music changed based on which guy was selected.
—The method of using emoticons next to the image of the character you're talking to was simple but effective.
—I have no idea how you put the little bouncing image next to the dialogue to express to the player there's more dialogue to read. Very neat.
—Also, the way the game was set up so there was a separate section where the player could input her name was cool. I ended up putting it into my game itself instead of making it a separate section like this, but this method has some definite advantages if multiple people were to be passing the game around.
As for the writing:
—As the creator said, there were a few typos in the sections for the two characters I looked at, but nothing which would impede the player's ability to understand what the characters are saying.
—I never interpreted Diluc's character as being so protective on a personal level. Yes, he protects Mondstadt, but that's different than being overly protective of a particular individual. That being said, I know some girls like that kind of behavior from a guy so it was probably smart to include it. (I would never date anyone, so I know I'm not the right woman to consult on these matters, but personally I wouldn't even be friends with someone who treated me like that. It's one thing if you know my ability level at various skills and keep me from getting in over my head, but to have someone constantly fussing over my safety like that seems more insulting than reassuring or flattering.)
—Zhongli had a very funny dialogue section, which I've included a screenshot of. I laughed over this contract line for a good two seconds.