Looks like minecraft at first glance. Alot of programmers work on stuff alone nowadays but reach this level.
If someone showed my this movie and told me it is from minecraft, I would believe them. I am not a minecraft player but what I have seen of minecraft looks very similar to this movie.
But I think it makes more sense to compare to whenever it was worked on as a solo project. :)
yes, it is very impressive that this is the work of a solo developer.
Working on that project for so many years gave me alot of respect for game developers in general. Also makes me sad to see all the projects never gaining any visibility on Steam. Imagine putting all those hours into something, generally after work, and then it just fades away on day one? Gives me shivers.