If your goal is to find games with a lot of content, be wary of judging by file size, especially if it's a VN type game with lots of pictures.
Using png rather than jpg can inflate the game size by a factor between 3 and 10. I see it quite often, but I'm not sure if it's an amateur's mistake or if devs think that game size is some dick-measuring contest where they'll impress (or mislead) potential players with a huge file size.
Dreams of Desire may be an example of this size inflation. However, it's a good game. Lots of writing, lots of sex, everything looks great. But--from the images available in the directory--everything appears to be png, making it a 4.something GB game rather than 1.something.