The game already has goblins in it

? There will be more content with them in the future.
That's good to hear because the thumbnails only show human and ghost lewds, otherwise I'd have never been able to find out if you didn't say so! ^_^ Either way it's on my "to do" list of games to check out, PROBABLY right after I finish going through all the new content in "A Struggle with Sin"... Personally, I prefer this game's animation style to the more realistic CG but I can always appreciate quality loops overall!
I think your doing something wrong if your numbers are that low? You should be making over 100g each time with the basic boat and over 200g with the upgraded one.