House Builder - Electric City Expansion Pack a must-have for those who want to learn a bit about electricity while having fun.
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If you still haven't got House Builder, it's best to buy it in a bundle with your game, cheapest now in a Halloween Bundle:
https://store.steampowered.com/bundle/46618/Halloween_Games/
If you already have all games you are interested in, maybe look at these.
Aquatic Store Simulator, which is coming out on November 5 and Purrrifiers: Cleaning Chaos which will launch coop demo on November 8!