I really liked this concept! Even though I didn't find any players to play with, it was still very fun to roam around and build myself a small snow castle. The mechanics are well implemented and this would be very fun with friends. The only thing I'd like to see is that placing blocks is instant instead of taking time because right now it takes a while to build a castle. The first person controller can also be a bit slidy so it's hard to stay on blocks when jumping around, but that's just nitpicking. Fun concept and very well executed for your first gamejam! Congrats!