To make like an old, rusted shack, you can use This but make it more old looking. Credit to: @gimkit_h4ck3r And, you can add like a mail box using barriers, and the green alien plant to look like grass. 
Game possibilty
You can make a plot, where if people were to go to the town, the people come to see the town, but the town is weird. I guess you can say the people in it act weird, and they are under a curse. You look for clues and things like that in some places, and it gives you the answers on how to break the curse.