ffleader1

Okay, so I figured out the problem. Apparently the images are not the same sizes and devs just crop them by code, from image to image. Anyway, I have to use paint to crop out 1-2 pixel of the images, and the are a handful of them. Just put this here in case anyone with a similar situation need this.

Actually, the whole game on Denpa is $20, and if they charge 15 for core game, 5 for patch, and Steam sale 50% then that would be $12.5 in total. I will be happier for sure.
I bought Root Double ($35) on Steam with 20% sale. I can pay huge sum of cash, so long as the contents that I am buying is worth it, meaning I don't feel like being rip off.
So even in your scenario, if a game worth of $30 and $5 for 18+ patch, which means the publishers have gauged and measured the contents value, in which case I won't complain.
Also, FYI, on Steam, I support developers to the point when a game has any DLC, I buy them all (with VN, they are just mostly music of artbook). So, yeah, price is a problem, but I don't care about it  as much as I care about fairness.

My bad. Sorry.
My bad.

He removed the patch and wrote an announcement
if I have to epitomize it: Dovac is an a$$hole

Let me try answer your question here.
For Aselia, actually JAST and Steam version was come from fan translated version. For a little history lesson, according to VNDB it was already translated back at 2010 and from there they decided to work together with JAST in order to get it officially released. And the rest is history. In regard of the reason why they translated all age version, I believed it's more likely in regard of the all age version that they translated was had more polished interface and had new content compared to 18+ version before instead of loli issues (Actually, the Steam version was PS2 to PC port of Eien no Aselia, while Xuse was just managed to add PS2 port version the H-Scenes after the translation was finished). As what you missed in all age version, it was some H-Scenes and the evil route when MC was raping all of the spirit. Other than that, maybe sanahtlig here could explain more.
I think it was very possible if you play Seinarukana without playing Aselia first, and in fact if you didn't had enough time might as well did that. Although if you played Aselia you may realized some connection in regard of one character at Seinarukana though (Once again if you really want to support Seinarukana, just support it and I think there's enough spoiler if you search enough on internet regarding the connection between Aselia and Seinarukana).
Hope my answer here was helpful to you.