The map looks awesome, but the big basement room took me a long time to find, consider adding another entrance or drawing attention to it somehow.

Got it! Thank you for explaining, will do better next time.

It's enemies only.
But, if you're clever with moving objects and triggers and enemy placement, it can be possible for a level to play differently depending on how and where you put the dudes.

Thank you! Does this only affect enemies, or is there a way to make it affect objects too? Each Fortress level I uploaded has objects that other Fortress levels don't have, it would be cool if I could have them on different layouts.

Go into the lower right corner of the level editor where the layouts are.
There's a big fat green plus icon that lets you add more to the list.

For decent variety, you should have about 3+ layouts per difficulty tier. Probably several extra for Bronze since people see that one more.

That would be cool, but I have no idea how to do that, and I couldn't find a respective guide.
I'm not a fan of making a mess with similar uploads, can you please share with me how exactly do I compile them?

Hey! I noticed that you've posted this same level twice with different difficulties.

For next time, may I recommend that you avoid this and instead compile all your layouts for a level into a single upload? Thank you.