Shockingly I do know what demos are, I also have played all their games. It's important to give critiques so they actually know what to what the may need to rework or consider rather than just blind adoration and saying it's perfect. Usually for a demo, you're showing what you've finished so far and sometimes will be in the finished product. What they finished so far is awesome but I do have concerns about the lack of options and that being a possible reflection of what to expect for the rest of the gameplay upon completion.
If we say 'YES THIS IS PERFECT NO NOTES' then there's a chance that they won't realize or consider that the roleplay aspect of the game isn't to the potential of their first one. That's why it's a demo no? For players to play and give actual feedback so they can think about what to work on or make sure they're going in the right direction. It's not an attack on them, I know what they can do and they can make great games! Player feedback is not a bad thing.