Thank you! That trailer is actually nearly 1 year old now, it's from the pre-alpha stage of the game. Unfortunately, we had no time to update the trailer with all the new things. We are way to busy with all the release preparations. Last time it took us around 10 days (2 people full time) to make it.

What game engine and stack did you use to finish this? It's very well done, how big is your team and how long did it take to get to beta?

Thanks! We use custom engine written in C# for simulation and Unity 3D for rendering. The game simulation can run without Unity.

Our "team" is tiny, it's just two of us. We've been working on it past 6 years as a hobby project over the weekends. Last year we decided to quit our tech jobs and focus on this full-time. We work with freelancers who do 3D art and music for us.