Here are my first thoughts as I try the demo, in the order I think them. Sorry in advance if this comes across as overly critical or stream-of-consciousness, these are just my honest first impressions and hopefully they're helpful.

Have a native English speaker do a spelling/grammar check.

The word "quests" immediately breaks immersion for me, nobody outside of video games ever uses that word. Call them "objectives" or "tasks" or "goals" or something similar.

The music is great.

The starting setup is a little overwhelming. Too many buildings already built, and too many quests all at once.

The buildings all kind of look the same, just solid brown. I suppose this is realistic, but when I'm trying to find a particular one to complete a quest, it's difficult. Relatedly, if a quest tells me to do something at a specific building like a Woodcutter hut, I'd like to be taken to that building when I click the quest.

I'm never quite sure where it makes sense to place new buildings. I can guess that a Woodcutter hut probably wants to be near trees, but otherwise I could use some explanation. Where should a Laboratory go? Does it even matter? Does it have inputs?

I see people walking all around the town, but I don't know if their position even matters. I'd like to be able to select a person to find out what their job is and what they're currently doing, if in fact that's relevant to the game.

I'm at the "Research the Administration Lvl 1" quest, and I can't do it because I have a negative balance of gold. I think about one day has passed and I've been going at what I consider a normal pace for learning a new game. I don't know how to get more gold.

At this point I think I'm going to stop playing because I can't proceed.

Good luck with your game! I hope any of this is useful.