All games are produced and assembled in the USA.
1) Can you name another game system similar to yours?
Washington's Crossing is an operational game. The game play is similar to that of Great Campaigns of the American Civil War by Multi-Man Publishing, Inc./Avalon Hill Inc. and Kevin Zucker's Campaigns of Napoleon 1X Series by Operational Studies Group.
2) Why doesn't the map look wintery like during the campaign?
The Washington's Crossing map will be connected to other maps from different campaigns to developed in the future.
3) Is there any errata for the game?
Yes, errata and player aids for Washington's Crossing can be found here.