For this scene, I used Unity and some art packages on the asset store.
Here are the assets used :
– Synty Studios POLYGON – Apocalypse Pack: https://assetstore.unity.com/packages/3d/environments/urban/polygon-apocalypse-pack-154193
– ZugZug Art Halloween Pumpkins : https://assetstore.unity.com/packages/3d/props/exterior/halloween-pumpkins-50597
I made the ghost and the playground slide with Houdini.
Great article.