First of all, I love the game, I can see myself spending hours upon hours in this already. A few things that I noticed, not particularly negative as I will enjoy the game nontheless.
I found the game or at least the research and seasons be extremely fast paced. I played for 11 hours straight and took my time with it and I still finished with the research.
I felt a little pressured when I still wanted to build with wood and thatch but when I already researched bricks.
The seasons also feel rather quick and winter doesnt really seem intimidating after the first one. I never had an issue with cold nor food after the first winter and as the winter was rather short it never really became an issue again.
Personally I think the game could benefit by slowing things down a tic and maybe increasing the birthrate for new sapiens.
Well this would be my initial feedback. I had experienced some bugs, nothing gamebraking or annoying I think it is really refined.