Can't say the story premise is very original, but there isn't much good western games with a female heroine in fantasy setting with NTR genre. In Japanese games, the damn censorship ruins everything, and most games on dlsite are simply lame. Here, the art style is very attractive, sex scenes have some simple animations, which is small, but plus too. So I keep my eye on your project. Though, I should point out a few things that I would like to bring to your attention.
In the nude static image of heroine, her left boob looks, a bit weird, like she moved to the side by some force/pressure
Since from the beginning I liked the main heroine looks, which reminded me of another heroine from a different game I liked, I'll attach screenshot of her (couldn't find nude picture unfortunately, but found quite reveling dress at least) to give you an example of what I find weird in Emma's standing sprite
Another thing is quite funny, though. It seems to me the devs wanted to add some size difference fetish, but it not went that well because of two things. The hero Cross already has quite impressive package, so when Emma see Hermit's member, her reaction isn't that very convincing, since their difference is probably ~3-4 cm. If I wanted to add such fetish, I would make their size difference more noticeable and would reduce Cross penis size. Another thing related to art is Hermit's balls, honestly, I don't really like even talk about it, but it's just too noticeable, to not say about it. In his picture, the contrast of the size of his penis with the size of his balls stands out too much, causing the opposite effect of what was intended. It gives the feeling that he has either enchanted only his penis by increasing its size, but forgot to do the same with balls, which makes him look more like a cripple (I'm sorry for such comparison).
The last thing about art is the sprite images with towel, they don't exist no matter the choices you make. I guess, it's limitation of the demo version, so it's not a big deal, but still would want to see the game a bit more polished in that regard.
As people said, the corruption progression, sex statistic is important, it would be really strange to play without it, since it's the center theme of the game. So far, all our choices regarding this corruption doesn't look like recorded, so that they would take effect in next event's or conversations between characters. But I guess, it's the demo limitation again, I just hope such thing will be in the game eventually. Also, not sure if pure route is even an option, storywise it doesn't make much sense, but I guess we will see. Just too many corruption games, which have such route, usually punish the player for playing that way. Playing that route not very rewarding comparing to efforts, it lacks of images and flavor text etc. In other words, it's just made for the sake to be in the game. While I don't really want to play that way in this story just yet (I'm not too attached to the characters), allowing players to enjoy it as much would probably be a good feature of the game.
The last thing would be the elf guy. I don't exactly understand their relations with hero and Emma, but he quite shitty companion I must say. Basically their leader on verge of death and not only he's not hurrying to help him, but almost even blackmailing Emma to flash her tits. Not only it's very petty, but also too early in my taste, would have much more sense, if he would use different strategy more clever and cunning (he is an elf after all) instead of such childish blunt request. But in place of Emma, I would get rid of him right away, I don't get his motivation and it seems to me, like he would make more damage to the party than good. His motives simply don't seem right. The other guy, give the opposite effect and I'm really curious to see how Emma will be forced to do lewd things with him, while they both would feel guilty, but eventually could bury this feeling and start to sincerely enjoy it. That's the true corruption I would like to see.
Anyway, I hope you find my critique justified and I also wish you success in your game. See you in the next update.