The concepts of the game like befriending, mating, breeding (when do I get to breed again? Do I only get to breed each mate once? What does breeding season actually do?), requests (what is the point of actually doing them besides roleplaying being nice to your tribe?), temperature and sleep (couldn't notice any effects from temperature and being tired) are pretty vague and could be more well explained.
Making a big creature will have it fill out most of the screen, which is very obnoxious and prevents you from watching your creature's beautiful animations. Adjusting the zoom depending on creature size and/or letting you zoom out farther would help a lot. I also made my creature quite tall with long neck and long legs if that matters.
Pathfinding can be kinda broke sometimes. I couldn't fulfill the request of bringing my offspring a rock because his pathfinding broke. Could be another large creature exclusive problem.
Finding friends and mates again is very difficult, and losing your nest is frustrating. A map with friends, mates, accepted quests and nests marked would be nice.
Combat is definitively... something. Targeting the right enemy without accidentally hitting your friends was a way bigger challenge than anything the enemies ever threw at me. I think I only ever took any damage once or twice.
Brooding to speed up your egg would be a fun feature.
My main gripe with this demo is that it runs very poorly on my PC, but I guess that is a pre-early access problem and I respect that it is hard and takes time to make a game well optimized. I couldn't get very far because my game crashed twice.
If anyone else reads this and has performance issues, I would suggest changing "borderless windowed" to "full screen". It helps a lot.
On a positive note, the game feels pretty satisfying to play. Big creatures feel very powerful, but hard to maintain and need lots of food as a balance. Forming a family is fun. My creature is adorable.