Too long; doesn't give a shit: read
PrinzEugen00's review as that reflects most of my criticism, but if you wanna see me nitpicking things compare to Ambrosia, please continue.
After spending like 120 hrs, though not totally 100% the game yet, but I feel like this game doesn't live up to Ambrosia at all. I had my hope up when people praised it to be better than Ambrosia, but sadly no. It's not a bad game per se, but compare to Ambrosia, it's definitely an inferior game, in every aspect in my opinion.
I'll try to keep it short for the review.
I noticed that Shimobashira designed this game to have non-accidently-mess-up your game in mind. For example, in Ambrosia, some instances can cause you to lose virginity without warning whatsoever. In Celesphonia, however, if you have lust level 1, there's only one instance that Amane can lose virginity from losing to enemy, others will either "torture" her or face fuck, butt fuck her, but no virginity taken. In the overworld, the game will either warn indirectly or it's optional prompt or prevent you from committing the act all together.
My biggest problem with Celesphonia is character corruption progression. In Ambrosia, you can pretty much turn maledom into femdom: in the beginning everyone is trying to rape Flode and she hates it. But once you get to Indecency lv 3, Flode is pretty much raping men with consent.
In Celesphonia, it doesn't matter what Lust you're at, it's always maledom, it changes Amane's dialogues sure, but it doesn't change the role in the scene whatsoever.
Prime example being Dex in Ambrosia and Tanemaki in Celesphonia. The two has the same goal which is to fuck the protag, but you can turn Dex to Flode's sex slave in Indecency lv 3 scene. Whereas Tanemaki will just keep raping Amane and turn her to his sex slave with Lust lv 3 scenes, and the game has specific ending for that as well.
To make matters worse is that Dex is tied to the main story, so if you want to progress the story you have to deal with him. Tanemaki will show up and grope Amane's butt and that can be the last time you'll ever see him if you're not exploring. And Tanemaki's scenes are just optional side quest too and the whole setup also has poor writing.
Speaking of poor writing. I do not know if the dialogues are to fit modern day or the translator is just some kid with Japanese knowledge, the language used in Celesphonia is horrendous. You're gonna see the word "fuck", "shit", "hell/fuck yeah" a lot.
And the writing tone in this game feels like Pokemon's plot. Oh, there's an evil organization and there's a big baddie, we need to defeat them.
Whereas in Ambrosia, though contrive and silly maybe, the story and the dialogues still show seriousness in it.
Okay, I'll stop it here, I want to address more issues, but who's gonna read this review anyway.