A few years ago I asked the same question, "Any stages planned beyond 5?" and got a very forward answer that it won't be happening and it'd be too much work.
Understandable. Sad though, what drew me to Oppi's game (and the original "A way back home") was the rare and welcome occurance of well done weight gain in a vore game with great visuals.
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Hah, yea, I would never expect myself to polish my lance to some pixelized sprite images, but here I am now lol
Who knows, maybe in the far future, in case when it is going to be his flagship/money milking game and the plot is finished, he might have some more time to spare and pimp that out, one more T.H.I.C.C stage would be welcomed
(Btw, u convinced me to play "A way back home", over and out o7)