1 - The game is in-development and is updated episodically, meaning when a new chunk of story content is done. All of the endings are "to be continued" and will pick up in the next story update. I'll announce a release date once it's finished.
2 - Alex, Asher, Dominic, Griffin, Isaiah, Marco, Matt, Owen, & Riley. A few more characters may become romanceable as I write.
3 - Probably not since the game is so heavily choice-based. Story games without any/many choices can drop you in by chapters, but since the story for this game changes based on hundreds of prior choices, that's not really feasible here.