Yes, there are a couple of automatically generated biomes (desert, forest, village, snow) that you can use as a base for your map and adjust to your likings. I am planning to add many more over the time. You can also have a look at our discord, there is a map-showcase channel with plenty of maps with download links.
There is no way to play the game in 2D because you are creating 3D worlds with it. With the last patch I implemented different quality setting so it will run way more smoothely on lower end systems. Performance highly depends on the map you are creating. Wind, water, lights will have a big effect.
I would recommend using a GPU Gtx970 or newer. But we even have people running it on a tablet (I don’t know the model though).