I paid for the full version and yeah, definetly get it lmao. It's not the full game yet, it's just Arc 1, Part 1, which is essentially the demo + WAYYYY more stuff (nsfw is more included too). I literally JUST finished playing the game lmao.
It ends with Jayce finding out about Blake and then, obv, we need to wait for the update (check out the "meet his enemies" to know more about the arcs). The arcs aren't out yet, but they will be soon hopefully!
And to answer your #2, I think there will be ways for MC's personality to be influenced by YOUR decisions. Like... in the demo (and full game), we can make decisions that influence our personality (like when we can choose to say its exciting or intimidating, etc). I'm not the creator though so I'm just spitballing lolll.
I hope you get the full game though; super fun!!