Hey Jellyfish, right now i am actually working on an online store, took a lil break from Unity, but actually the map is just a 3d model i found online, the model was very small so i copy pasted it a bunch of times and moved it around to make it look like a lot of terrain, the buildings being up and down was probably from the one that modeled the terrain, probably just let the buildings be seen through the ground
Also may I ask, did you find this game through itch.io or from Brackeys discord server?