Just to update you Arthur, playing the demo as long as possible was pretty good. I wasn't frustrated or anything. You basically get to a point where you are stuck however because you can't have more than 7 villagers in the demo. It would be pretty hard to raise a new generation with just 2 kids. I think it WOULD be possible. But you aren't really doing anything at that point. You have your food stabilized and your research is pointless now because you can only buy harvesting level 2. I think you should have had a demo puzzle though to give a taste of puzzles.
I bought the game by the way. When I got home from work today I was at the point where I wasn't really doing anything anymore so I wanted to buy. But I do think you should have had a puzzle to give an idea of what they are. Well I haven't even seen a puzzle yet so... yeah. I still don't have an idea. If I am playing a game that I started in the demo version, can the puzzles appear? Because I thought I'd just continue my game from earlier.