Currently, there is only one path. But the plan is to introduce a Karma-System which will have 3 endings with 1 girl each specific for that Ending.
"The plan is"...
Three and half year, up to the 0.9 update, and he still haven't put the basic
$ karma += X
and
$ karma -= X
needed for his "I'll add the karma system soon" to not sound like pure bullshit. That he still don't know exactly how the karma would have an influence, why not. But he could at least have done this, for the actual players to benefit from it when he'll finally know.
As interesting as can be the story, it's the main point of the game and as it, we will know 95% of it when it will meet its end. The only possible difference will be that we will have less sex opportunities, and perhaps a little more story content for a given girl. Not many will replay the game just for this.
But this is just my speculation.
And mine is that he just don't know how to make the game like he said it will be one day.
Actually, the game as he develop it, is like building an on floor house, then once you've finished building under it a cellar that double as garage. It would be a fucking pain in the ass, need more time that building the full house the first time, and there's high risk that everything collapse during the process. You need to at least have built its foundation beforehand. Or, in the present case, effectively implement your variable system and change the values, even if so long you don't effectively make the story react to it.
Not that the story don't worth it as it is, just that it will probably never be as he say it will be.