I remember Beloved Rapture from a very old demo. Plot really seemed interesting. (I usually like different kingdoms and war and stuff ... and then some deeper things happening in the background.) Looking forward to this and the full release.
Theia - I played it 1-2 years ago (most recent of the ones in this list) - and I also liked the plot. And lot's of stuff to do and different characters, etc.
Forever's End had nice gameplay and story. And enough stuff to do. Hopefully we'll get more of this.
Vacant Sky: I played the older version listed as "Original version". Here I usually do not like this type of setting ( if I remember correctly the world seemed a bit more modern-themed) but the story later ... was really great. Probably #2 in terms of story in this list of only five games. Some "Vol. 2" and... as RPG maker game ... would be nice.
Love and War: Act I probably the one where I liked the story and characters most. I also played only older versions of the Act 1 and I think a pretty long demo of Act 2. I really wish for this to get completed. Gameplay did not seem too interesting though. (At least in the old version I played.)
Not in this list - because not on rmn: Quintessence - The Blighted Venom: This was super great as well. (Unfortunately did not fully get finished.) Great sound and atmosphere and story and plot.