The group of Belgium looks like the toughest since each of them had 4 points each but it is unfortunate for Ukraine because it's very really sad that they all shared equal points in the group but they didn't qualified for the round of 16 due to goal difference because they had -2 goal difference while Slovakia got 0 goal difference then Romania and Belgium shared 1 goal difference each. I know the feeling when a team tie with others in points but got eliminated or didn't proceeded further due to goal difference.
It looks like all the countries in group E may not really qualified for the next round because if you check their upcoming matches you will see that the matches are going to be more tougher than anything they have ever seen on the group stage so they all need to buckle up their game because Belgium will be meeting France, Romania will be meeting Netherlands while Slovakia will be meeting England, so you can see that is a very tough matches for the clubs in group E.
In terms of Slovakia match with England I may not no what the exact results will be but without being told we no that right from there history of football England is always higher in performance than Slovakia because of the quality players they possess, though England has not really been themselves this season because they seem to have been struggling during there group stage but however there is a big difference between group stage and round of 16, so they will use all they have to win the match.