Eraser would probably be a useful tool but turning a city into a hamlet by deleting buildings is... not a very straightforward way. Alternatives:

• https://watabou.github.io/city-generator/?size=5&seed=1688724215&greens=0&farms=... - a very small town with all the features disabled, still too urban
• https://watabou.github.io/village-generator/?seed=300380425&tags=small%2Clow%2Cn... - Village Generator