The dev himself said a few weeks ago (shortly after 4.0 was leaked) that he made 5.0 nearly unbeatable without the hints on purpose. Hints, of course, should have been only available to his patrons until the official release date. This was an attempt to create a kind of poor-mans-DRM, where you can only progress the game if you fork over the dough to the dev.
Well you can see how that worked out. Hopefully Celavie learns something from this, the game itself is not that bad in my opinion, at least it won't be a few versions ahead when we have actual worthwile sexual contect, including cumshots.