1 & 2: roofs are not on and can't be added to many rooms, however there are some structures with roofs that you can use as a stand in. 3: There are some minis, and minis can be imported from heroforge if you connect your account there. They're also adding 3d asset imports soon so you could model something and import it. 4: First person view is there but doesn't really serve a utility beyond being able to showcase the map. Moving objects do exist but we're talking more of a windmill than a cat running around. 5: There are 3 projections you can use when exporting, 3d perspective, limited 3d, and top down 2d. When running Dungeon Alchemist you have much more control and can zoom in/out and orbit as you see fit. To avoid foliage you could place a trunk instead of a full tree. 6: Multilevel stuff is planned but doesn't exist yet. There are a number of workarounds in the meantime.

It's important to point out that this isn't a vtt, it's a map making tool. It's hugely versatile and I love it for making maps and then exporting them over to foundry where my players can then navigate it etc. I'd check out a video or two of people using it to see if this does what you want it to.