Hello again. I am going to be releasing a full walkthrough with the release of version 0.06 which will be coming out at the end of this month, so in about a week.
There can be some points where you don't have any quests and you'll need to speak to one of the main characters to get another one. The way to know if you've done everything that can be done at this point is to check the "phone" item in the inventory and then select "character data". If all the hearts for every character are filled in (not including the ones with locks on them). If they're all filled in then you've finished everything in the current version.