The way Assemblr works is very simple. You can start as many new projects as you want, using tons of different tools to make all kinds of buildings from scratch. You can use various materials, as well as add moving or static objects to bring your ideas to life. It's incredibly easy to use, so you can experiment and ultimately use the platform however you want.
But your creations won't exist in a vacuum. You'll have to build it in a particular setting, choosing between the desert, the snow, or the ocean, for example. You can also use a design view mode.
Assemblr is an excellent app for bringing your creations to life without any limitations. Try it and discover everything you can do!