I haven't published a novel on Tapas, but I can at least give a viewpoint as someone who has studied traditional publishing and manuscript layout.
Here's the scenario > You wrote your first draft using the suggested manuscript format used by many traditional publishers: 12-point, Courier New font, double-spaced with 1" margins all around, on a basic 8.5x11'' sheet. This layout, in turn, will result in every page to hold around 200 words, which is the equivalent of one page in a (roughly) 6x8'' published novel.
So keeping this in mind, publishing around 700 words on a single "page" in Tapas is the equivalent of publishing about two-to-three pages of your novel at one time. It only seems "shorter" to mobile readers because the scrolling makes a large novel seem more like a wink of a short-story.
If people are asking for more, this means two things: One, congratulations! Your story is so good that people "want more, dang-it!" And two, if both you, the writer, and the readers want more, then give them more. Upload two or three "pages" in one sitting instead of one. This would force you to write more and think more ahead with your story, but I personally don't see that as a bad thing.
Hope this helps!