I mean they start out fairly easy and then get harder. The units were nice though some had the same attacking power though had a different way of showing it. The structures were fun and added to the game. The graphics are very nice and I enjoyed the map designs as the missions went on. There are the city areas and then there are the snow regions which all have there own distinct look.
Units look fairly well and are easy to tell apart from another unit.
Since this is 2D I have to say they did a very nice job. Sound was o.k. I would have liked to hear some more different music though it was ok. When a lot of infantry units were firing all at once sometimes it would lose there sound of firing and only you would hear the music. That was a problem though overall I have to say it was alright though could of been worked on.