When I reviewed the map, the second mission had not been released yet so I cannot really
judge how your changes there affect gameplay. I have your project on my radar for re-reviewing,
but I would prefer to see more work done & maps added before that.
For the first map I can say that your changes are mostly visual or quality of life improvements
with little impact on the gameplay itself.
I am not saying that these changes are unimportant or do not affect the visual presentation of
your maps, but given the fact that you are working on existing material when editing Blizzard maps,
I am sure you will agree that the gameplay must also be affected in some way.
If you take a look around in the Map Section, you will find a lot of edited Blizzard campaign maps
that are in Substandard because of the changes being not enough.
If you wish to discuss the matter about Substandard itself, feel free to create a thread in either
Staff Contact or
Site Discussion.
Don't let something like "Substandard" discourage you from continuing to work on your project, still.

The name may be connected with "low quality" but if you look i. e. at the Substandard creations in
the Models section, you will find some great model edits. They are in Substandard due to being simple
edits but many of them are still extremely useful and great to use.