Most of the states look nearly identical. That would be hard spotting an imperfection in a state seal on a blue backdrop jammed into an irregular shape.
Colorado and Wyoming might not need trimming though.
I feel like the cross on Greece was too big as well. It (almost) went from top to bottom and side to side, while it's actually smaller and would still be smaller on a map.
I finished with less than a second because I had every country except Ukraine and all the countries were in alphabetical order. So the only European country alphabetically after United Kingdom is Vatican City, so I don't know why Ukraine is after United Kingdom, but luckily I typed it with less than a second.
the shades are off and the cross is too big. the cross (almost) goes from top to bottom and side to side, while normally it's smaller. Also on maps like these.
Ukraine as a sovereign state includes Crimea. Ukraine's national borders have been recognised (even by russia) since 1991 when it became independent. The fact that russia doesn't respect Ukraine's sovereignty and national borders (that have been recognised internationally), doesn't make Crimea "russian". It is a territory of Ukraine temporarily occupied by russia (due to unlawful annexation of it in 2014).
Consider listing the answers non-alphabetically. Once you guess three or four countries most of the others can be narrowed down by guessing countries in between.
I found this tough. Note to self for next time I am reading these comments - I must learn more flags. Got 100% on second attempt, which doesn't really count. Let's see what I get next time.
Colorado and Wyoming might not need trimming though.
United Kingdom - England
Portugal - Portuguese Empire
Greece - Greece (40s/50s or something era)
Poland - Upside down
San Marino - Saint Lucia
Ukraine - Upside down