I agree with you; the biggest surprises of the tournament so far have been in Group E. If Belgium suffers another defeat, they may not be eliminated because they can still qualify out of the group as the third-placed team. However, this situation would make their job harder. Considering today’s performances, it is possible that Ukraine will finish last in the group, and Belgium will end up third.
This is just their first game and I think it is way too early to judge them base on this performance today alone, The game is still open and Belgium can still come out top in their group if they win all their remaining matches from here despite that they lost in today's game but the correction may come in their games ahead, and I still doubt Belgium won't qualify for next stage of this competition.
Overall Belgium game today was no better than Slovakia and of course this is beyond our expectations, at first I thought Belgium would play impressively because they were playing with the main squad moreover, I still remember how they played in qualifying but unfortunately today Belgium lost.
By the way Belgium still has 2 matches ahead against Romania on June 23 and Ukraine on June 26 so Belgium must win these 2 matches if they want to secure the next round and if they only win once then they are not safe, between these two matches, against Romania it is an important match because if Romania win then they will definitely be safe by collecting 6 points.
A lot of expectations was cut short today, I can't believe that Belgium team couldn't withstand Slovenia today, I expected them to win and even placed bet on them in three different ways, to win either half, win full time and to score over 1.5 goals and they ruined all the tickets, it was so annoying watching them play cause over the years the Belgian team have been dominant in the Euros and winning against Slovenia shouldn't be a difficult task for them but they lost, so disappointing. Ukraine is not going to be a very easy team for Belgium to beat and they should perform more better than they did today if they want to win that game, I hope they do but I think they'll beat Romania and that should give them a boost when they Ukraine two days later. However I enjoyed watching France play, they deserved the victory and should've scored more goals, too bad their star player Mbappé got seriously injured, I noticed he was bleeding much and I hope it's nothing something very serious that would keep him away from their next match.