Hum, this bring nostalgia!
This author have, back in the day, a vlog when he spoke about his next game. I went here periodicaly to see the progression of the game he made, and even see that he doesn't protect the acces of his site very well. Like one part of the site url was called "project10" so i just change that by "project9" and would have acces to all of these drawing of these game who will never be release. Most of them where just old design (which is already cool in itself) but since he never created another game since ages, a lot was put into the creation of this game who never gonna see the light of the day, sadly.
Now he has put some drawing from the dlsite blog something like 3 years ago but it wasn't the same design. I've always wonder what have happen to the man, why did he stop creating these so unique gems? Now that i'm better at japanese, maybe i should dig a little into it, i dunno : )