It's a cool little prototype of a game. Kind of need a way to rotate the camera to see how far back the map goes, there's some tutorials and stuff out there, should be able to get it to use the mouse and rotate the camera around the player (I usually do 2D stuff though).
Also, if you don't put a collider where you don't want players to go, a player is going to go there and fall off the map. lol.