It's been discussed in this thread multiple times before, I'm pretty sure it was clarified that this will not be a standard full harem setup, you have to pick and choose. Certain LIs disqualify other LIs. I think you will need to play through the game 2-3x to see all routes fully.
Of course in all honesty it will be years before the game is "finished" if it ever is. The quality of the graphics on this one are great, but the development pace is very slow. I would just enjoy it for what it is, while it is... and not obsess about how the ending will work, when we don't even know if we are going to ever see the ending in the first place. And even if the "plan" IS to have you pick one final girl to commit to, I seriously doubt the dev will stick to that in the long run, because again he works very very slowly, and crafting a bunch of alternate paths with diverging endings would take forever.