Okay, I really like how you're incorporating characters from past works as it is always nice to see character development of, otherwise, minor characters into characters with stories to tell, but...
...While I enjoyed the prologue up until the encounter with the humans who's dice are rigged (and, yes, I reloaded nearly a hundred times before I quit playing) and then, many hours after I was no longer angry and curiosity got the better of me, I decided to see what failure entailed, but... It was like you jumped straight from a heartbreaking bad end to what I felt like was being thrown into an entirely different game with familiar faces that can be summed up as "create a party based on who you're gonna end up sleeping with" using only the barest of details as to why... ¯\_(ツ)_/¯
...And that leads me to the question of are we to presume this game is going to pursue a polyamorous route or is Dyne in an "oPeN" marriage with Cornelius (so, sleeping with everyone will be his shtick)? Of course, that raises questions 'bout how committed Zandahrell is to Lairen, since... It sounds like copulation is a must for that race to be... Functional? Granted, to each their own, but these are dynamics I'd want to know more 'bout before committing to a fuller version of the game, but that just really brings me back to the transition from Lairen to Dyne...
Basically, the transition needs work AND, to be honest, if you started with a story of how Dyne came to learn all 'bout the Lavadi, what they can do for him, how they're summoned, etc., which happened to lead to something or someone that starts a flashback about the final days of Lairen and Zandahrell, which then goes back to Dyne setting out on this quest, it'll feel less like we're getting the short end of the stick with Lairen as well as make the adventure of Dyne & CwBs seem, IMHO, less out of place.
Keep in mind, the Android version of the demo had zero flaws (unless you count humans with rigged dice), so serious congrats there, plus the art is gorgeous and the music is spectacular as usual... However, I always appreciated the animated aspects of the CGs in Endless Bounty/Engaging Destiny, so I hope you’re able to incorporate that (which is not to say the scene in the demo wasn't heartwarmingly amazing, just y'all are kind of known for animated CGs), but if not, that's okay (though I do hope you'll consider it)... Umm... I think the layout and D&D-esque aspect is fun and has a lot of potential (but save scumming is inevitable, so making fail options more enticing just means the number of saves I make will double, since I'll just pursue both and simply continue playing from whichever outcome I find more desirable in the end), but since we didn't get to level/allocate stat points/increase bonuses/affect stats with stuff/etc., it seemed very... Inconsequential? But I get it, it is a demo and I'm sure those stats will really matter in the full release (and more so than I decided my travelling partying based on who I want to see get it on)... Oh, but I absolutely loved the CODEX feature and hope it'll be, or continue to be, more elaborate in the full version of the game (although you might want to consider adding a section to the CODEX to explain each stat, their purpose, how bonuses work, etc., if only as a reliable point of reference).
...Beyond that... Just excited to see where this game goes~ 😉